Limbic System

Question 1

Mention cortical structures of limibic system

Answer 1

Limbic lobe
Septal area
Hippocampal formation
Prefrontal cortex

Question 2

Mention subcortical structures of limibic system

Answer 2

Hypothalamus, anterior nucleus of thalamus, amygdaloid nucleus

Question 3

Mention connecting pathways in limbic system

Answer 3

Fornix
Cingulum
Sria medullaris thalami
Stria terminalis
Medial forebrain bundle

Question 4

Enumerate parts of limbic lobe

Answer 4

Subcallosal area
Cingulate gyrus
Ismthus
Parahippocampal gyrus
Uncus

Question 5

Write in brief connections of Papez circuit

Answer 5

1. Cingulate gyrus recieves signals from association areas connected to parahippocampal gyrus & uncus via cingulum
2. Parahippocampal gyrus is connected to hippocampus
3. Hippocampus is connected to mammillary bodies via fornix
4. Mammillary body is connected to anterior nucleus of thalamus via mammillo-thalamic pathway
5. From ant nucleus of thalamus to cingulate gyrus via anterior thalamic radiation

Question 6

The amterior end of hippocampus is called……, …..is a thin white matter layer beneath ventricular surface of hippocampus. These converge to form ……. cont with crus of fornix

Answer 6

Pes hippocampis
Alveus
Fimbria

Question 7

Crura of fornix come close near midline forming……., behind it is……which crosses the midline. Anteriorly it forms……..which end on mammillary bodies

Answer 7

Body of fornix
Commissure of fornix
Columns of fornix

Question 8

Crura of fornix come close near midline forming……., behind it is……which crosses the midline. Anteriorly it forms……..which end on mammillary bodies

Answer 8

Body of fornix
Commissure of fornix
Columns of fornix

Question 9

Mention func & connections of septal areas

Answer 9

F, center of pleasure
C, medial forebrain bundle connects septal areas & amygdaloid nuclei to hypothalamus
Stria medullaris thalami: connect septal areas to the habenular nuclei

Question 10

Describe position of amygdaloid nucleus

Answer 10

Close to tail of caudate, anterior to the hippocampus in relation to tip of inferior hor of lateral ventricle

Question 11

Describe result of the following:
1. Lesion of Papez circuit in chronic alcoholism
2. Bilateral amydalectomay

Answer 11

1. Anterograde amnesia
2. Docility, hyperphagia, increased sexuality