Limbic System. Limbic System. The term "limbic" is from the Latin word Limbus , for "border" or "edge". The limbic system is a set of primitive brain structures located on top of the brainstem and buried under the cortex It separates the medial surface of the cerebral cortex from diencephalon.
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The limbic system includes:
1. Limbic lobe.
2. Hippocampal formation.
6. Anterior thalamic nuclei
7. Hypothalamus (mammillary body)
10. Habenular nuclei
Fornix consists of:
The fornix is an important component of PAPEZ CIRCUIT
Since the initial description, connections to additional subcortical structures have been identified.
The entorhinal cortex is part of the medial temporal lobe or hippocampal memory system and constitutes the major gateway between the hippocampal formation and the neocortex.
The name entorhinal (inside rhinal) cortex derives from the fact that it is partially enclosed by the rhinal (olfactory) sulcus.
It is involved in emotional responses, fear, anger, hormonal secretions, and memory.
Feeding and drinking
Agnostic (fighting) behavior
Mating and maternal care
Responses to physical or emotional stresses.
Loss of normal fear/anger response
Site: Located anterior to the interventricular foramen below the rostrum of corpus callosum
Function: It provides critical interconnections and it is the pleasurezone.
-Made up of fibres arising from hippocampus
-Body of the fornix is suspended from corpus
callosum by septum pellucidum
-Posteriorly,divides into two crura.
-The crura are interconnected by fibrespassing from one another forming hippocampal commissure.