Limbic System and Limbic Circulatory Overview
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| The principal effector elements of the limbic system are ? | * hypothalamus and the reticular formation
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| Basic action of the Limbic System ? | *Provides emotions…..all sensory info filters in to limbic system and translates it to what we do autonomically
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| Limbic functions ? | *HOME ---homeostasis, olfactory, memory, emotion
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| Limbic inputs project to ? | * hypothalamus
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| The informational flow into the hippocampal formation permits ? | * provides a link to past experiences (memory)
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| 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
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| Limbic Structures that give rise to the the 4 main functions ? | *Homeostasis - hypothalamus
*Olfactory - olfactory cortex
*Memory - hippocampus
*Emotions -amygdala
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| The Limbic Cortex or Lobe forms a ring around ? | * callosum callosum and upper brainstem-diencephalic junction
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| The Limbic lobe includes ? | *subcallosal area
*cingulate gyrus and isthmus of the cingulated gyrus
*parahippocampal gyrus
*the uncus
*The temporal pole
*Orbital frontal gyri
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| The hippocampus lines ? | * the lateral ventricle
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| Limbic System Components ? | * Amygdala
*Mammillary body
-Anterior nucleus
-Mediodorsal nucleus
*Nucleus accumbens
*Basal forebrain
*Septal nuclei
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| Produce ACh ? | *basal forebrain and septal nuclei
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| The Papez Circuit ? | *hippocompal fibers --> fornix --> mammillary body --> mammillio-thalamic tract -->anterior thalamic nucleus --> cingulate gyrus --> hippocampus
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| major output from hippocampal formation ? | * fornix
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| limbic lobe info to hippocampal formation ? | * Cingulum
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| 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
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| The collective processes of these neurons form the olfactory nerve? | *Olfactory bipolar neurons
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| supporting cells- maintain neurons ? | *Sustentacular cells
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| maintain a continuous population of olfactory neurons – make new neurons ? | *basal cells
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| The lateral olfactory stria terminates in ? | * the primary olfactory cortex
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| 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
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