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Limbic Sys. Overview

Limbic System and Limbic Circulatory Overview

The principal effector elements of the limbic system are ? * hypothalamus and the reticular formation
Basic action of the Limbic System ? *Provides emotions…..all sensory info filters in to limbic system and translates it to what we do autonomically
Limbic functions ? *HOME ---homeostasis, olfactory, memory, emotion
Limbic inputs project to ? * hypothalamus
The informational flow into the hippocampal formation permits ? * provides a link to past experiences (memory)
Entry of information into the limbic system is either ? * directly to the amygdala (fear), or indirectly to the hippocampal formation (memory), via the entorhinal area
Limbic Structures that give rise to the the 4 main functions ? *Homeostasis - hypothalamus *Olfactory - olfactory cortex *Memory - hippocampus *Emotions -amygdala
The Limbic Cortex or Lobe forms a ring around ? * callosum callosum and upper brainstem-diencephalic junction
The Limbic lobe includes ? *subcallosal area *cingulate gyrus and isthmus of the cingulated gyrus *parahippocampal gyrus *the uncus *The temporal pole *Orbital frontal gyri
The hippocampus lines ? * the lateral ventricle
Limbic System Components ? * Amygdala *Mammillary body -Anterior nucleus -Mediodorsal nucleus *Nucleus accumbens *Basal forebrain *Septal nuclei
Produce ACh ? *basal forebrain and septal nuclei
The Papez Circuit ? *hippocompal fibers --> fornix --> mammillary body --> mammillio-thalamic tract -->anterior thalamic nucleus --> cingulate gyrus --> hippocampus
major output from hippocampal formation ? * fornix
limbic lobe info to hippocampal formation ? * Cingulum
The olfactory system is remarkable in four respects ? *primary afferents occupy the surface epi, *The axons of the primary afferents enter the cerebral cortex directly, *primary afferent neurons undergo turnover, being replaced from basal stem cells, *The pathway to the cortical centers are ipsilateral
The collective processes of these neurons form the olfactory nerve? *Olfactory bipolar neurons
supporting cells- maintain neurons ? *Sustentacular cells
maintain a continuous population of olfactory neurons – make new neurons ? *basal cells
The lateral olfactory stria terminates in ? * the primary olfactory cortex
links the olfactory cortical areas with the hypothalamus and brainstem ? * The medial forebrain bundle -----* olfactory comples-->medial bundle-->hypothalamus/brainstem.....these trigger ANS responses such as salivation, and gastric contractions
Created by: thamrick800