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Limbic
WVSOM -- Medical Neuroanatomy -- Limbic System
Question | Answer |
---|---|
What is the function of the limbic system? | cognitive and visceral responses to emotion and processes involved with memory |
Where are limbic system structures located? | around the corpus collosum on medial surface of the cerebral hemispheres |
What makes up the limbic system? | cingulate gyrus, hippocampus, parahippocampal gyrus, amygdala (uncus) hypothalamus, and anterior/medial thalamic nuclei |
What is the purpose of the papez circuit? | circuit that permits a cognitive and visceral response to emotions |
What are the 6 steps to the papez circuit | cingulate gyrus recieves inpout from neocortex and thalamus. 2/3) cingualte projects to hippocampus and amygdala 4)projections form parahippocampal gyrus and uncus thru fornix to mamillary bodies 5)mamilary bodies project to m/a thalmic nuclei 6)neocortex |
What are the layers of the hippocampus? | stratum radiatum, stratum pyrammidale and strata oriens |
What is in stratum radiatum? | dendrites |
What is in stratum pyrammdiale? | soma |
Waht is in strata oriens? | proximal axons |
What is the functino of the hippocampus? | processing and storing of explicit memory for long-term storage |
What are the 2 different types of memory? | explicit and implicit |
What memory is stored in the hippocampus? | spatial memory |
What is explicit memory | knowledge of people, places and things along with the meaning of those facts. Spacial memory included |
What is implicit membory | knowledge of how to perform a motor or perceptual skill |
What does damage to the hippocampus result in? | inability to form new long term explicit memories. Short term memory intact |
What is LTP? | Long-term potentiation. Synapses are enhanced to addition of AMPA receptors to post-synaptic membrane. |
What is LTD? | Long Term Depression. Synapses are reduced in effeciency due to removal of AMPA receptors from the post synaptic membrane. occurs after a bout of low frequency action potentials in teh presynaptic neuron |