Diencephalon: Epithalamus (Pineal Body)

Question 1

Site

Answer 1

Connected to 3rd ventricle posterior wall by pineal body stalk

Question 2

Parts

Answer 2

Pineal body stalk is penetrated by 3rd ventricle pineal recess which subdivides stalk into:
1. Upper part
2. Lower part
(Roots)

Question 3

Lower root

Answer 3

Curves downwards covering posterior commissure

Question 4

Upper root

Answer 4

Connects both Habenular trigones (Habenular commissure)

Question 5

Functions

Answer 5

1. Ductless gland secreting melatonin
2. Plays role in biological clock rhythm
3. Secretes indolamines and polypeptide hormones which regulate hormones secreted by adenohypophysis (anterior pituitary)

Question 6

Fate

Answer 6

1. Becomes fibroses
2. Usually contains calcareous deposits in adult life