Diencephalon

Question 1

Site

Answer 1

1. Lies between lower parts of both cerebral hemispheres above midbrain
2. Surrounds 3rd ventricle

Question 2

Subdivisions

Answer 2

1. Thalamus
2. Metathalamus
3. Subthalamus
4. Hypothalamus
5. Epithalamus

Question 3

Thalamus

Answer 3

1. Cerebral cortex secretory
2. All impulses (except smell) have to stop and synapse in thalamus before reaching cortex

Question 4

Metathalamus

Answer 4

Formed of lateral and medial geniculate bodies which are attached to lower surface of thalamus posterior part

Question 5

Subthalamus

Answer 5

1. Lies directly over midbrain
2. Contains motor nuclei in extrapyramidal tracts pathway from cerebral cortex to lower centers

Question 6

Hypothalamus

Answer 6

1. Lies in front of Subthalamus
2. Contains certain autonomic nuclei

Question 7

Epithalamus

Answer 7

Formed of:
1. 2 Habenular nuclei (trigones)
2. Habenular commissure
3. Pineal body
Relay station on descending pathways from cerebral hemispheres smell centers to midbrain tegmentum