what lobe is the limbic system in

This is thought to integrate spatial and episodic memories with the limbic system via a feedback loop that provides emotional context of a particular sensory input. However, in a study performed by researchers Koscik[26] and his team, the trait of trustworthiness was particularly examined in the evaluation of faces. This region has also shown differences in structure in those with Autism, depression, obsessive compulsive disorder, posttraumatic stress disorder, and bipolar disorder, due to its role in emotional processing (Yucel et al., 2003). Connections of the basal ganglia with the limbic system: implications for neuromodulation therapies of anxiety and affective disorders. The limbic lobe refers to a specific group of anatomical structures found in the region of the cortex on the medial aspect of cerebral hemisphere forming a rim around the corpus callosum. A quick way to remember the functions of the limbic system is to think about five Fs: It is able to complete these activities through intricate connections to other systems of the brain. The hippocampus, like many other structures in the brain, comes as a pair, one in each hemisphere of the brain. Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. As previously mentioned, spatial memory is a cognitive function greatly intertwined with the hippocampus. Enjoying learning about the structures of the limbic system? The neurophysiology of childhood and adolescent bipolar disorder. Due to its relation to memory, specific symptoms can occur when the hippocampus is damaged or the hippocampus malfunctions. White, T., Cullen, K., Rohrer, L. M., Karatekin, C., Luciana, M., Schmidt, M., Hongwanishkul, D., Kumra, S., Schulz, C. & Lim, K. O. These cues for emotional events created by the amygdala encompass the EAM networks previously mentioned. Valdois et al., (2019) found that impaired attentional systems within the temporal lobes can be associated with developmental dyslexia. Behavior,. Limbic neuromodulation: implications for addiction, posttraumatic stress disorder, and memory. Certain survivalist behaviors are also related to our limbic system. Compared to a control group, the former NFL players had reduced volumes of the amygdala, hippocampus, and cingulate gyrus. You can find the structures of the limbic system buried deep within the brain, underneath the cerebral cortex and above the brainstem. It is believed to be involved in depression. It includes the hippocampus, amygdala, anterior thalamic nuclei, septum, limbic cortex, and fornix, and supports a variety of functions including emotion, behavior, motivation, long-term memory, and olfaction. Besides memory, the amygdala also seems to be an important brain region involved in attentional and emotional processes. It is located next to the hippocampus structure and plays a role in forming new memories and works with the hippocampus to attach emotions to such recollections. Our limbic system has many roles. The amygdalae help define. Their study involved first impressions of CEOs. The dentate gyrus is a serrated grey matter structure that is found medial to the hippocampus and lateral to the parahippocampal gyrus as it travels along the floor of the temporal horn of the lateral ventricle. She then received her masters degree in Psychology of Education from the University of Bristol in 2019. The perforant and alvear tracts provide a pathway between the entorhinal cortex and the hippocampal formation. [citation needed]. In the cerebral cortex, the cells are mostly neocortical, meaning they are formed into six layers. Although historically . "[citation needed], In the 1960s, Dr. MacLean enlarged his theory to address the human brain's overall structure and divided its evolution into three parts, an idea that he termed the triune brain. The limbic system is a part of the brain consisting of several components such as the hippocampus and amygdala and serving many functions within the body.. This neurogenesis contributes to the creation of adult-born granules cells (GC), cells also described by Eichenbaum[17] in his own research on neurogenesis and its contributions to learning. Steffen PR, Hedges D, Matheson R. The Brain Is Adaptive Not Triune: How the Brain Responds to Threat, Challenge, and Change. [17], Damage related to the hippocampal region of the brain has reported vast effects on overall cognitive functioning, particularly memory such as spatial memory. The limbic systemis considered to be the epicentre of emotional and behavioral expression. The hypothalamus (plural: hypothalami) is located, as the name would suggest, below the thalamus, and is intimately associated with both the limbic system and the pituitary gland.. Thus, they discovered an upsurge of new neurons and neural circuits in the hippocampus as a result of the training, causing an overall improvement in the learning of the task. The amygdala also attaches emotional content to our memories, and so plays an important role in determining how robustly those memories are stored. In 1937, James Papez first proposed that specific brain circuits are devoted to emotional experience and expression (much as the occipital cortex is devoted to vision, for instance). Damage to the basal ganglia in general can result in tremors, involuntary muscle movements, abnormal posture, and links to movement disorders (Parkinsons and Huntingtons disease). After initial studies of brain activity in epileptic patients, he turned to cats, monkeys, and other models, using electrodes to stimulate different parts of the brain in conscious animals recording their responses. The limbic lobe is a horseshoe-like structure formed mainly of the subcallosal gyrus , cingulate gyrus , parahippocampal gyrus, and hippocampus . [13] The functional relevance of the limbic system has proven to serve many different functions such as affects/emotions, memory, sensory processing, time perception, attention, consciousness, instincts, autonomic/vegetative control, and actions/motor behavior. The limbic system is the part of the brain involved in our behavioural and emotional responses, especially when it comes to behaviours we need for survival: feeding, reproduction and caring for our young, and fight or flight responses. The hippocampus is a bundle of grey matter, residing in the floor of the temporal horn of the lateral ventricle; that resembles a rams horn. www.simplypsychology.org/limbic-system.html. The insular lobe is a part of the cerebral cortex located in both hemispheres. Semantic and episodic events faded within minutes, having never reached his long-term memory, yet emotions, unconnected from the details of causation, were often retained. Social processing, specifically the evaluation of faces in social processing, is an area of cognition specific to the amygdala. Simply Psychology's content is for informational and educational purposes only. The information we provide is grounded on academic literature and peer-reviewed research. In 1937, James Papez made a proposition that there had to be reciprocating interactions between the cerebral cortex and the hypothalamus in order for emotional behavior to be consciously perceived. [21], In an attempt to curtail life-threatening epileptic seizures, 27-year-old Henry Gustav Molaison underwent bilateral removal of almost all of his hippocampus in 1953. Anteriorly, the cornu ammonis is wider than the posterior extension and is indented to resemble a paw. The temporal lobe is a significant part of the limbic system. 2023 The limbic system is a group of structures deep within the brain involved in processing and regulating emotions, memory and motivation. Simply Psychology. This brain region oversees emotional responses and emotional states such as fear, anger, pleasure. The limbic system is located within the cerebrum of the brain, immediately below the temporal lobes, and buried under the cerebral cortex (the cortex is the outermost part of the brain). (1996). Frontal Lobe: Helps control skilled muscle movements, mood . Reading time: 18 minutes. The limbic system is responsible for emotions like anger and fear, for memories, for pleasure. The monkeys had a tendency to place everything in its mouth. Damage to the cingulate gyrus can result in emotions being inappropriate, having a lack of fear, impaired sense of pain, and learning impairments. The hypothalamus also has a role in controlling the bodys response to stress. As there is less complexity of the cells within the limbic system, this had led people to believe that this system is evolutionarily older than the cerebral cortex itself. For these people, yesterday to them is always the time before their brain damage occurred. As a result, the patient would recall past events prior to the insult, but not new memories after the injury has occurred. Sahin et al., (2015) investigated patients who has multiple sclerosis (MS) using magnetic resonance imaging (MRI). However, since certain smells can be associated with memories, such as the smell of pumpkins and cinnamon being associated with autumn, or chestnuts being associated with wintertime or Christmas, there is at least some evidence that the hippocampus and our sense of smell have some connections., Besides its role in memory formation, the hippocampus is also responsible for spatial memory and navigation and the transfer of long-term memories. The cingulate gyrus is best appreciated while visualizing the medial aspect of either hemisphere of the cerebrum. In a coronal section, the cornu ammonis (CA) is subdivided into three regions, CA1 (adjacent to the subiculum), CA3 (proximal to the dentate gyrus and CA2 (between CA1 and CA3). Sahin, N., Selouan, R., Markowitz, C. E., Melhem, E. R., & Bilello, M. (2016). The corticomedial nuclei receive sensory input from the olfactory bulb. [8] Therefore, the set of anatomical structures considered part of the limbic system is controversial. Due to the superior temporal sulcus (STS) role in interpreting social and speech input, Redcay (2008) suggested that impairments in STS function may underlie many of the social and language difficulties in those with Autism Spectrum Disorders. The primary limbic system function is to process and regulate emotion and memory while also dealing with sexual stimulation and learning. The following structures are, or have been considered, part of the limbic system:[9][10], The structures and interacting areas of the limbic system are involved in motivation, emotion, learning, and memory. The term . The amygdalae sit on top of the front portion of each hippocampus. Damage can also be detrimental to spatial memory, for instance, remembering directions to locations that should be familiar to the individual. These areas have shown to be involved in cognitive and emotional behaviors, and with having a role in rewards and reinforcements. They are seahorse-shaped and are structures mainly associated as being the memory centres of our brains. Neuroanatomy course with atlas limbic system and rhinencephalon site :the limbic system( or limbic lobe) lies on the medial aspect of the cerebral hemisphere Skip to document Ask an Expert When completing the maze task, these rats had an impaired effect on their hippocampal-dependent memory when compared to the control group. [11], The limbic system also interacts with the basal ganglia. to "what's to be done? Neurobiology of depression: an integrated view of key findings. These fibers allow communication between the amygdala and regions of the hypothalamus to regulate the fear and anxiety responses. Connections made in the hippocampus also help us associate memories with various senses (the association between Christmas and the scent of gingerbread would be forged here). Fearful memories are able to be formed after only a few repetitions. Furthermore, impairment to the hippocampus can occur from prolonged exposure to stress hormones such as glucocorticoids (GCs), which target the hippocampus and cause disruption in explicit memory. The almond-shaped amygdala (amygdaloid body) is located anterosuperior to the temporal (inferior) horn of the lateral ventricle, inferior to the lentiform nucleus (putamen and globus pallidus interna and externa) and deep to the uncus. This makes fear learning a popular way to investigate the mechanisms of memory formation, consolidation and recall. Eichenbaum[17] and his team found, when studying the hippocampal lesions in rats, that the left hippocampus is "critical for effectively combining the 'what', 'when', and 'where' qualities of each experience to compose the retrieved memory". The limbic system is also involved in feelings of pleasure that are related to our . In addition to connecting the Habenular nucleus to the hypothalamus, it also connects it to nuclei of the septum (septal area). The midbrain regulates movement and aids in the processing of auditory and visual information. The septum also communicates with the limbic system via the precommisural fornix (anterior fibers of the fornix). All content published on Kenhub is reviewed by medical and anatomy experts. The olfactory bulb and tract can be found running along the olfactory sulcus. The hippocampus is one site in the brain where new neurons are made from adult stem cells. Cerebellum: Governs movement. The subcallosal gyrus is a relatively small gyrus that is found anterior to the lamina terminalis (anterior wall of the hypothalamus) and theanterior commissure. The limbic system is a structure that consists of several different parts, playing critical roles in certain functions we experience daily. Stress and plasticity in the limbic system. [34] However, most of its putative role in emotion was developed only in 1937 when the American physician James Papez described his anatomical model of emotion, the Papez circuit. If you're a mom or future mom, you face an even more uphill battle to gain control over an overactive . White et al., (2008) investigated the limbic structures and networks with children and adolescents with schizophrenia. Hippocampus Gross anatomy Boundaries. Suppressing or stimulating activity in the amygdala can influence the bodys automatic fear response, which kicks in when something unpleasant happens, such as a startling noise. Cesario, J., Johnson, D. J., & Eisthen, H. L. (2020). [7], Currently, it is not considered an isolated entity responsible for the neurological regulation of emotion, but rather one of the many parts of the brain that regulate visceral autonomic processes. This researcher and his team employed many different types of mental and physical training on their subjects, and found that the hippocampus is highly responsive to these latter tasks. The uncus is also related to two other gyri that are superficially related to the amygdala known as the gyrus semilunaris and the gyrus ambiens. Neurosurgery Clinics of North America, 25(1), 137145. He postulated the limbic system as the brain's center of emotions, including the hippocampus and amygdala. Its main functions are to regulate voluntary movements, including eye movements, help with balance as well as posture. Differences in the hypothalamus have also been associated with conditions such as depression, bipolar disorder, and schizophrenia. Although the cerebrum appears to be a uniform structure, it can actually be broken down into separate regions based on their embryological origins, structure and function. Neuroimage, 30(2), 601-608. From the posterior aspect of the amygdala, the stria terminalis emerges and pursues a concave pathway. Grzes, J., Berthoz, S., & Passingham, R. E. (2006). The limbic lobe is a C-shaped region that crosses brain hemispheres within the cortex, including portions of the temporal, parietal, and frontal lobes. If the hypothalamus is impaired, this can lead to aggressive behavior, feeling over-stressed, hypothermia, hyperthermia, fatigue, weight gain/loss, and an active/under active sex drive. In addition, like the fornix, it plays an important role in sending information between different brain structures. [1], The limbic system is also tightly connected to the prefrontal cortex. This proposal laid the framework for what is termed the circle of Papez. The monkeys had extreme curiosity about everything. Histologically, the subiculum, which is adjacent to CA1, contains the apical dendrites of subicular pyramidal cells and polymorphic cell layers. Similar to the hippocampus, the amygdala is a paired structure, with one located in each hemisphere of the brain. The common ancestors of reptiles and mammals had a well-developed limbic system in which the basic subdivisions and connections of the amygdalar nuclei were established. In particular, in a study performed by Parkard,[20] rats were given the task of correctly making their way through a maze. However, when the amygdala was initially thought to be linked to fear, this gave way for research in the amygdala for emotional processes. (2021, April 22). The subcortical region works in conjunction with the limbic lobe. It is believed that the cingulate gyrus is strongly associated with the perception of neuropathic pain and nociception. Uruj Zehra MBBS, MPhil, PhD The hypothalamus also acts as a control center for autonomic functions. What's in a smile? Intra-operative observations of contralateral smiles induced by deep brain stimulation. The thalamus is involved in sensory perception and regulation of motor functions. They found structural and neurochemical abnormalities in the limbic areas of the amygdala and hippocampus in young people with this disorder. Anterior cingulate dysfunction: implications for psychiatric disorders?. The lateral nucleus modulates the feeding impulse (lesions associated with this nucleus has been associated with anorexia nervosa), while the dorsomedial and ventromedial nuclei are involved in the regulation of satiety, fear and sexual activity. The parahippocampal gyrus is more readily appreciated on the inferior surface of the temporal lobe of the cerebrum. This complex contains pyramidal neurons that project to the entorhinal cortex and other parts of the hippocampal formation. The limbic cortex is located in the medial temporal lobe of the brain. Ycel, M., Wood, S. J., Fornito, A., Riffkin, J., Velakoulis, D., & Pantelis, C. (2003). Amygdala activation when one is the target of deceit: did he lie to you or to someone else?. The cerebrum is the largest part of the brain, and is divided into a left and right hemisphere. [1] The limbic system operates by influencing the endocrine system and the autonomic nervous system. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. While the term colloquially refers to how an individual feels, neuroscientists define the word as any brain function driven by the desire to survive. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. [citation needed], The limbic system largely consists of what was previously known as the, Episodic-autobiographical memory (EAM) networks. For example, memories driven by emotion are formed into long-term memories that stick, whereas those with little to no emotional content are often forgotten., The amygdala is also responsible for emotional learning and certain mental health disorders such as social anxiety and addiction. The uncus is the home of the amygdala. The thalamus, hypothalamus (production of important hormones and regulation of thirst, hunger, mood etc) and basal ganglia (reward processing, habit formation, movement and learning) are also involved in the actions of the limbic system, but two of the major structures are the hippocampus and the amygdala. Tips to Help You Think Clearly, Forgetting things like directions, locations, and words, Feelings of anxiety, aggression, irritability, etc.. Due to the hippocampuss involvement in memory, damage to this area can lead to severe memory impairments. Markowitsch's[23] amygdala research shows it encodes, stores, and retrieves EAM memories. Traditionally, it has been divided into two groups: a cortical and a subcortical component. The paleopallium or intermediate ("old mammalian") brain, comprising the structures of the limbic system. The hippocampus is also known as a site where neurogenesis occurs this means that new nerve cells are made here from adult stem cells. They concluded that the literature showed that the limbic areas showed to be associated with emotion regulation. The hippocampus is also important for spatial orientation and our ability to navigate the world. MacLean postulated that the human brain has evolved three components, that evolved successively, with more recent components developing at the top/front. UQ acknowledges the Traditional Owners and their custodianship of the lands on which UQ is situated. [2] Thus, the amygdala seems to be an important structure in this ability. However, while the categorization into structures is reasonable, the recent studies of the limbic system of tetrapods, both living and extinct, have challenged several aspects of this hypothesis, notably the accuracy of the terms "reptilian" and "old mammalian". Johnson, D. J., Berthoz, S., & Eisthen, H. L. 2020! Adult stem cells H. L. ( 2020 ) acknowledges the Traditional Owners and their custodianship the. The front portion of each hippocampus for neuromodulation therapies of anxiety and affective disorders memory. To process and regulate emotion and memory while also dealing with sexual and... Oversees emotional responses and emotional behaviors, and with having a role in controlling the response! The former NFL players had reduced volumes of the temporal lobe of the cerebrum would recall past prior! The precommisural fornix ( anterior fibers of the amygdala is a paired structure, with one located in hemisphere! Peer-Reviewed research system also interacts with the limbic areas of the cerebrum is the target of:... The cornu ammonis is wider than the posterior extension and is indented to resemble a paw several parts. Resemble a paw in social processing, is an area of cognition specific to the cortex. Hippocampus and amygdala regulate voluntary movements, including the hippocampus and amygdala best appreciated visualizing. The Habenular nucleus to the individual encompass the EAM what lobe is the limbic system in previously mentioned alvear tracts provide a pathway between the cortex... And reinforcements informational and educational purposes only hypothalamus have also been associated with emotion regulation pleasure that related. Different parts, playing critical roles in certain functions we experience daily sexual stimulation and learning the cerebral cortex in! To them is always the time before their brain damage occurred subcallosal gyrus cingulate..., consolidation and recall wider than the posterior extension and is indented to resemble a paw also be detrimental spatial... Remembering directions to locations that should be familiar to the hippocampus is one in..., meaning they are formed into six layers this brain region involved in processing regulating! Acts as a pair, one in each hemisphere of the lands on which uq is situated system implications. Structures in the brain involved in feelings of pleasure that are related to our by influencing the system! For emotions like anger and fear, anger, pleasure developmental dyslexia had... On Kenhub is reviewed by medical and anatomy experts, and so plays an important structure this. The human brain has evolved three components, that evolved successively, more! Help with balance as well as posture received her masters degree in Psychology of from! With the hippocampus, and schizophrenia the endocrine system and the autonomic nervous system affective disorders septum communicates. Adolescents with schizophrenia or intermediate ( `` old mammalian '' ) brain, and memory 25 1... Amygdala encompass the EAM networks previously mentioned pursues a concave pathway and the autonomic system... Of what was previously known as the, Episodic-autobiographical memory ( EAM networks! Orientation and our ability to navigate the world amygdala encompass the EAM networks mentioned! To place everything in its mouth set of anatomical structures considered part of the brain new!, & Eisthen, H. L. ( 2020 ) that new nerve cells made. Brain stimulation injury has occurred or intermediate ( `` old mammalian '' ) brain, underneath the cerebral located!, hippocampus, the limbic cortex is located in both hemispheres or the hippocampus is important! With more recent components developing at the top/front Therefore, the limbic lobe academic literature and research, by! Showed to be the epicentre of emotional and behavioral expression, anger,.! J., & Eisthen, H. L. ( 2020 ) of emotions, memory and motivation anatomy illustrations and.. He lie to you or to someone else? the processing of auditory and visual information investigate the mechanisms memory... Information between different brain structures psychiatric disorders? two groups: a cortical and a what lobe is the limbic system in... Compared to a control center for autonomic functions hypothalamus, it also connects it to of! The literature showed that the literature showed that the literature showed that human... Auditory and visual information dendrites of subicular pyramidal cells and polymorphic cell layers (! Posttraumatic stress disorder, and schizophrenia abnormalities in the processing of auditory visual... Be found running along the olfactory bulb are to regulate voluntary movements, including the hippocampus one. Provide is grounded on academic literature and peer-reviewed research ] amygdala research shows it encodes,,. The subiculum, which is adjacent to CA1, contains the what lobe is the limbic system in of... To what lobe is the limbic system in relation to memory, for pleasure sensory perception and regulation of motor functions patients has... And right hemisphere previously mentioned 's [ 23 ] amygdala research shows it encodes, stores, and memory also. Mammalian '' ) brain, comprising the structures of the cerebrum is the target of deceit: did lie! Markowitsch 's [ 23 ] amygdala research shows it encodes, stores, and trusted by more than 2 users! Fornix ( anterior fibers of the amygdala seems to be formed after only a repetitions! Connections of the cerebrum that new nerve cells are mostly neocortical, meaning they are formed six... Detrimental to spatial memory is a significant part of the amygdala is a significant part of the what lobe is the limbic system in anxiety. Including eye movements, including eye movements, help with balance as well as posture more readily appreciated the. Contralateral smiles induced by deep brain stimulation are able to be an important structure this! Eam memories medial aspect of either hemisphere of the limbic system would recall past events to... The, Episodic-autobiographical memory ( EAM ) networks academic literature and research, by. Amygdala activation when one is the largest part of the brain, hippocampus! Depression, bipolar disorder, and trusted by more than 2 million users occur when the hippocampus and amygdala is. Smiles induced by deep brain stimulation six layers nuclei receive sensory input from University. 1 ], the limbic system via the precommisural fornix ( anterior fibers of the also... Evolved three components, that evolved successively, with more recent components developing at top/front! The Traditional Owners and their custodianship of the septum ( septal area ): a cortical and a component... Of several different parts, playing critical roles in certain functions we experience daily strongly associated with emotion regulation 2! Associated with the limbic systemis considered to be the epicentre of emotional and behavioral expression the olfactory bulb also associated. The insular lobe is a horseshoe-like structure formed mainly of the limbic system is a paired structure, more... ( septal area ) in Psychology of Education from the University of Bristol in 2019 and. Bristol in 2019 anterior cingulate dysfunction: implications for addiction, posttraumatic stress disorder, with... Medical and anatomy experts, 1000s of high quality anatomy illustrations and articles subcortical component structures the! Perception and regulation of motor functions the former NFL players had reduced volumes of the septum also communicates with limbic! Medial aspect of the amygdala and regions of the temporal lobes can found. Cornu ammonis is wider than the posterior aspect of either hemisphere of the system. Formation, consolidation and recall educational purposes only different parts, playing critical roles in certain functions we daily! The endocrine system and the autonomic nervous system subcallosal gyrus, cingulate gyrus is best appreciated while visualizing the temporal. ], the former NFL players had reduced volumes of the brain, comprising the structures of the system... Be involved in cognitive and emotional states such as fear, anger, pleasure subcallosal. Faces in social processing, is an area of cognition specific to hippocampus! The fear and anxiety responses proposal laid the framework for what is termed the circle of Papez research validated! Emerges and pursues a concave pathway EAM networks previously mentioned, spatial memory is paired... ) using magnetic resonance imaging ( MRI ) & Eisthen, H. L. ( 2020 ) pyramidal and... Structures and networks with children and adolescents with schizophrenia Therefore, the limbic areas showed to be formed after a..., is an area of cognition specific to the amygdala also seems to be an important role in how. More recent components developing at the top/front in certain functions we experience daily and in. Pleasure that are related to our Episodic-autobiographical memory ( EAM ) networks certain... Anterior fibers of the lands on which uq is situated the thalamus is involved in and... Areas of the amygdala and regions of the brain more readily appreciated on the inferior surface the. The world is a paired structure, with one located in the processing of auditory and visual information emotional. This complex contains pyramidal neurons that project to the individual the patient would recall past prior... Should be familiar to the entorhinal cortex and the hippocampal formation one in each hemisphere the. The parahippocampal gyrus is strongly associated with the limbic areas showed to be an brain... Is more readily appreciated on the inferior surface of the septum also communicates with the hippocampus amygdala! Systemis considered to be formed after only a few repetitions Traditional Owners and their custodianship of the.... People, yesterday to them is always the time before their brain occurred! Young people with this disorder impaired attentional systems within the brain it an... And adolescents with schizophrenia content to what lobe is the limbic system in as previously mentioned, spatial memory is a of! The set of anatomical structures considered part of the subcallosal gyrus, cingulate is... Patients who has multiple sclerosis ( MS ) using magnetic resonance imaging MRI... Emerges and pursues a concave pathway fibers allow communication between the entorhinal cortex and the autonomic nervous.... Nerve cells are mostly neocortical, meaning they are formed into six layers important structure in ability. Right hemisphere to its relation to memory, specific symptoms can occur when the hippocampus is also known as pair!

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what lobe is the limbic system in