1. FOURTH VENTRICLE By
Dr Shivarama Bhat P

2. VENTRICLES 2 Lateral Ventricles. Third ventricle. Fourth ventricle.
Terminal ventricle.

4. VENTRICLES

5. VENTRICLES

6. FOURTH VENTRICLE

7. The Fourth Ventricle (ventriculus quartus)
Cavity of the hind-brain is situated in
front of the cerebellum and
behind the pons and
behind upper half of the medulla oblongata.

9. FOURTH VENTRICLE PARTS
Roof (dorsal wall)
Floor (ventral wall)
Lateral boundaries
Four angles

10. LATERAL BOUNDARIES Upper Part:-- superior peduncle middle peduncle
FOURTH VENTRICLE
LATERAL BOUNDARIES
Upper Part:--
superior peduncle middle peduncle
Lower Part:– inferior peduncle fasciculus cuneatus
fasiculus gracilis

11. Floor -RHOMBOID FOSSA Median sulcus Locus cerulus Sulcus limitans
FOURTH VENTRICLE
Floor -RHOMBOID FOSSA
Median sulcus
Locus cerulus
Sulcus limitans
Median eminence
Vestibular area
Superior fovea
Facial colliculus
Striae medullaris
Inferior fovea
Hypoglossal triangle
Vagal triangle
Area postrema

12. FOURTH VENTRICLE

15. DORSAL WALL Upper Portion of the roof Lower Portion Inferiorly
FOURTH VENTRICLE
DORSAL WALL
Upper Portion of the roof
superior peduncle
superior medullary velum
Lower Portion
inferior medullary velum
Inferiorly
tæniæ of the fourth ventricle

16. FOURTH VENTRICLE
ROOF

18. RECESSES

20. ROOF Three openings, a median and two lateral:
FOURTH VENTRICLE
Three openings, a median and two lateral:
1 median aperture (foramen Magendii),
2 lateral apertures (foramina of Luschka) By means of these three openings the ventricle communicates with the subarachnoid cavity

22. ANGLES Superior angle Inferior angle Two lateral angle
FOURTH VENTRICLE
ANGLES
Superior angle
Inferior angle
Two lateral angle
Superior angle- continuous with the lower end of the cerebral aqueduct.
Inferior angle -opens into the central canal of the medulla oblongata.
Two lateral angle

23. CHOROID PLEXUSES Highly vascular inflexions of the tela chorioidea
Invaginate the lower part of the roof of the ventricle
Each consists of a vertical and a horizontal portion
The structure presents the form of the letter T, the vertical limb being double

25. HYDROCEPHALUS

26. Questions 4th ventricle – Long essay.
Enumerate the connections of 4th ventricle – Short answer.
Floor of 4th ventricle – Short essay.
Roof of 4th ventricle – Short essay.