Anatomy 18 Flashcards
(53 cards)
What is the 3rd ventricle?
A narrow slit like cleft between the 2 halves of the diencephalon
What is the roof of the 3rd ventricle?
1) Thin layer of ependyma
stretched between lateral walls containing choroid plexus.
2) More superiorly, fornix, septum pellucidum and corpus callosum
What is the anterior wall of the 3rd ventricle?
1) Columns of fornix
2) Anterior commissure
3) Lamina terminalis
What is the floor of the 3rd ventricle?
1) Hypothalamus:
a) Optic chiasma
b) Tuber cinereum
c) Mammillary body
2) Tegmentum of midbrain
What is the posterior wall of the 3rd ventricle?
1) Pineal body
2) Posterior commissure
3) Aqueduct of sylvius
What is the lateral wall of the 3rd ventricle?
1) Thalamus
2) Hypothalamus
The 3rd ventricle is connected with the lateral ventricle through __ and with the 4th ventricle through __.
Interventricular foramen; cerebral aqueduct
What are the recesses of the 3rd ventricle?
1) Optic
2) Infundibular
3) Suprapineal
4) Pineal (within the stalk)
What is the choroid plexus of the 3rd ventricle formed of?
Tela choroidea above the roof of the ventricle
Vascular tela choroidea projects __, invaginating the:
Downward on each side of the midline; ependymal roof of the ventricle.
The blood supply of the choroid plexus of third ventricle is derived from the:
Choroidal branch of posterior cerebral artery
What is the 4th ventricle?
A diamond shaped cavity of the hindbrain
Where does the 4th ventricle lie?
Behind the pons and open medulla and in front of the cerebellum
The 4th ventricle’s superior angle is continuous with __, while its inferior angle is continuous with __.
The cerebral aqueduct of midbrain; the central canal of closed medulla (at the obex).
The 4th ventricle has _ lateral recesses. What is their pathway?
2; they curve around the inferior cerebellar peduncle and open by lateral apertures in the subarachnoid space at the flocculus
The roof of the 4th ventricle is _ shaped and is formed of:
Tent;
1) The superior cerebellar peduncles (SCPs)
2) The superior medullary velum (SMV) stretching between the 2 SCPs
3) The inferior medullary velum (IMV) which has a median aperture (of Magendie) connecting the 4th ventricle to the subarachnoid space.
The choroid plexus of the 4th ventricle is _ shaped and formed of:
T; highly vascular tela choroidea
The choroid plexus of the 4th ventricle is suspended from:
The inferior half of the roof
What is the blood supply of the choroid plexus of the 4th ventricle?
Posterior inferior cerebellar arteries (vertebral arteries)
What are the subarachnoid cisternaes?
1) Cerebello-medullary cisterna (Cisterna magna)
2) Pontine (ponto-medullary) cisterna
3) Interpeduncular cistern
4) Cistern of lateral fissure
5) Callosal cistern
6) Chiasmatic cistern
Where is the Cerebello-medullary cisterna (Cisterna magna) found?
Between the cerebellum and the roof of 4th ventricle
Where is the Pontine (ponto-medullary) cisterna found?
In front of pons and medulla
Where is the Interpeduncular cistern found?
Over interpeduncular fossa
Where is the Callosal cistern found?
Above corpus callosum
