2.  Pineal body
 Pituitary
 Thalamus
 Hypothalamus
 Optic cup and stalk

3.  3rd ventricle

4.  Roof plate and 2 alar plates
 Basal plates and floor plates absent

5.  Single layer of ependymal cells covered
by a thin layer of vascular mesenchyme.
Together constituting tela choroidea and
choroid plexus

6.  Form lateral walls of diencephalon
 Divided into a dorsal(thalamus)and
ventral(Hypothalamus)portion by a
transverse groove called hypothalamic
sulcus

7.  Active proliferation of thalami causes
them to bulge inside the lumen of 3rd
ventricle and eventually they meet in
midline by massa intermedia or
Interthalamic connexus/adhesion

8.  Forms a no. of nuclei concerned with
visceral functions like
 Sleep
 Digestion
 Blood pressure
 Temperature Regulation
 MAMILLARY BODIES: Develop as
protuberance on ventral surface of
hypothalamus one on each side of midline

9.  2 fold origin
 1) Rathke’s pouch:An ectodermal
outgrowth from stomodeum just in front
of buccopharygeal membrane
 2)Infundibulum: A downgrowth from
diencephalon

10.  Rathke’s pouch soon loses its connection
from stomodeum and comes in close
contact with infundibulun

11.  ANTERIOR WALL:
 Cells undergo proliferation producing
ant.lobe of pituitary/Adenohypophysis
 PARS TUBERALIS:A small extension of this
lobe around the stalk of infundibulum

12.  POSTERIOR WALL:
 Forms pars intermedia that seem to have
no significance in humans

13.  Two parts
stalk and infundibulum
 Forms pars nervosa/Post.pituitary
lobe/Neurohypophysis(contains
neuroglia and nerve fibres of neurons in
hypothalamic nuclei)

14.  Appears as epithelial evaginations from the
caudal most part of roof plate
 Eventually develops as a solid organ on the
roof of mesencephalon
 Frequently Calcium gets deposited inside it
which becomes visible on radiographs of
skull
 FUNCTION: Serve as pathways through
which light and darkness affect and control
endocrine and behavioral rhythms.