Function Of Limbic System

Question 1

Enumerate functions of limbic system

Answer 1

Olfaction, control of feeding, control of emotions, maternal & sexual behaviour, motivation, relation to memory, control of autonomic responses.

Question 2

…….is responsible for perception of senstaion,…..is responsible for conscious discrimination…… is responsible for emotional response, …..is responsible for olfactory memory.

Answer 2

Pirirorm cortex
Neocortex
Amygdala
Entorhinal cortex

Question 3

Lesions in amygdaloid nuclei cause……….

Answer 3

Moderate hyperphagia & amniophagia

Question 4

Mention result of stimulation of each of the following with respect to emotions:
1. Areas of amygdala + lateral nucleus of hypothalamus
2. Areas of amygdala + periventricular nucleus
3. Ventromedial nucleus of hypothalamus

Answer 4

1. Rage & aggression
2. Fear
3. Placidity

Question 5

Lesion of hippocampus leads to……

Answer 5

Anterograde amnesia

Question 6

Mention centers and NTs for reward motivation

Answer 6

Lateral & ventromedial nuclei of hypothalamus. Less involved are amygdala, septum, certain areas of thalamus & basal ganglia
Dopamine mainly, less, norepinepherine & serotonin

Question 7

Mention centers and NTs for punishment motivation

Answer 7

Periventricular nucleus of hypothalamus extending in periaqueductal grey. Less involved are amygdala & hippocampus
Acetylcholine

Question 8

Mention the group to which the follwing nuclei of hypothalamus belong:
1. Periventricular
2. Arcuate
3. Tuber cinereum

Answer 8

1. Anterior
2. Medial
3. Lateral

Question 9

Describe hypothalamic control of endocrine glands

Answer 9

1. Nervous control on posterior pituitary (ADH & oxytocin) and adrenals through sympathetic nerves
2. Hormonal through release of hypophysiotropic hormones on anterior pituitary

Question 10

In H.T., stimulation of…..leads to sympathetic effects while…..leads to para.

Answer 10

Posterolateral nucleus
Anterior nucleus

Question 11

Feeding center is found in….., while satiety center is found in……The latter contains……

Answer 11

Lateral
Ventromedial
Glucoreceptors

Question 12

Explain excessive hunger in diabetic patients

Answer 12

Glucose entry to satiety center is insulin-dependent.

Question 13

Describe how HT controls water balance

Answer 13

Control water intake by thirst center in lateral nuclei & water output by ADH from posterior pituitary.

Question 14

Heat gain center is in……, while heat loss center is in…..

Answer 14

Post HT
Ant HT

Question 15

…..nucleus controls circadian rhythm while……controls sexual behaviour

Answer 15

Suprechiasmatic
Most ant & most post parts of HT

Question 16

Stimulation of……..leads to arousal while stimulation of……leads to sleep.

Answer 16

Posterior HT
Anterior HT