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33 Cards in this Set
- Front
- Back
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What is the function of the limbic system?
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Generate powerful emotion (fear, rage, rage), olfactory integration, short-term memory, eating, & reproductive behaviors
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Where do the efferents from the limbic sys go? Why?
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hypothal & habenular nuc: elicit visceral & somatic responses via BS& SC nuc
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How is the olfactory sys arranged?
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Olfac receptors embedded in epi. Axons of receptors compose CN1. Enter skull through cribiform plate. Terminate in olfac bulb glomeruli.
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What is unique about olfac receptor neurons?
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They can be replaced by cells adjacent to the ventricles.
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What are the principal cells of the olfac bulb?
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Mitral cells (axons form the olfac tracts)
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Where does the olfac tr terminate?
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Anterior perforated substance & pyriform cortex (temp lobe)
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What is the course of the olfac tr?
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Follow the lat olfac tr & end in the ipsi cortex near uncus @ the lat edge of the ant perforated substance & in the amygdala (terminates directly in cortex)
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How is info exchanged b/w olfac bulbs?
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Via the medial olfac stria & ant white commissure
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What can cause rhinorrhea?
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Fracture to the floor of the ant cranial fossa involving the cribiform plate. CSF leaks from nose.
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What can cause unilat anosmia?
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Meningiomas arising from the floor of the ant cranial fossa. Impinges the olfac bulbs & tr
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What are uncinate fits?
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Epileptic discharges w/ olfac hallucinations & invol movements of the tongue & lips
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What can cause uncinate fits?
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Inc intracranial press compresses uncus against free edge of the tentorium cerebelli
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What does the limbic lobe consist of?
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Cingulate, parahippocampal, hippocampal gyri & amygdala. Bilat & c-shaped
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Where is the hippo located? Shape?
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Floor of the temporal horn of the lateral ventricle. C in sagittal & seahorse in coronal.
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What is the afferent relay to the hippo?
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From: Neocortex to cingulate gyrus then to entorhinal cortex. And to the septal area via diagonal band of Broca
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What is the major outflow of the hippo?
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The fornix which terminates mainly in a mammillary body. Other fibers cross to contra septal region, ant thalamic nuc or hypothal
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What is the input to the septum?
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Amygdala (via stria terminalis & diagonal band) & Hippo (via fornix)
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What is the septal output?
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Widespread to the cortex (also hypothal & BS via medial forebrain bundle and habenular nuc via stria medullaris)
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What is the major limbic structure of the hypothal?
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Mammillary bodies
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What is the input to the mammillary bodies?
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From ipsi fornix
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What are the output to the mammillary bodies?
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1) mammillothalmic tr (ends in ant nuc of thal) 2) Mammilloetegmental tr (projects to BS) 3) others via medial forebrain bundle
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What type of info does the amygdala receive?
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A great deal of sensory
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What is the input to the to the amygdala?
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Olfac (via thal relay), hippo, hypothal, septum, BS, & limbic
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What is the reciprocal path to & from the amygdala?
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Stria terminalis (connects it to septuim & hypothal)
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What is the function of the amygdala?
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Integrative center of autonomic & visceral functions. Integrates emotional expression w/ meaningful behavior. "linchpin"
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What is the function of the habenular nuc?
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Involved in integrating info from the septal & rostral hypothal areas for reproduction
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What is the input to the habenular nuc?
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From the septal are via stria medullaris. To interpeduncular nuc (BS).
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What is the limbic input to the BS?
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Medial forebrain bundle, dorsal longitudinal fasciculus, & mammillotegmental tr
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What is the pathway of the Papez circuit?
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Hippo, fornix, mammillary bodies, mammillothalamic tr, ant nuc thal, cingulate gyrus, parahippo, hippo
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What is the function of the hippo in learning?
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Short to long-term memory (incorporates emotions)
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What is lesioned in Korsakoff's syndrome?
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mammillary bodies, hippo, dorsomedial thalamic nuc
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What causes Kluver-Bucy syndrome?
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Massive lesion to temporal lobe (amygdala, hippo, parahippo gyrus).
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What are the symptoms of Kluver-Bucy?
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No emotions, hypersexual, psychic blindness,
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