The lateral ventricles are C-shaped cavities located within the cerebral hemispheres. Each lateral ventricle consists of four parts - the central body, anterior horn, posterior horn, and inferior horn. The ventricles are lined with ependyma and circulate cerebrospinal fluid from its production in the choroid plexus through the lateral, third, and fourth ventricles before being absorbed into the subarachnoid space. Disorders of cerebrospinal fluid circulation like hydrocephalus can be treated with procedures like ventriculoperitoneal shunts or endoscopic third ventriculostomy.

1. Lateral Ventricle
Dr. Kumar Satish Ravi
MBBS,MD(JIPMER),MNAMS,FAIMER(M-FIILIPE),D.Litt.
Editor In Chief, National Journal of Clinical Anatomy
Additional Professor, Department of Anatomy
All India Institute of Medical Sciences Rishikesh

2. Learning objectives
• Positioning of ventricles
• Parts of lateral ventricle
• Relations of lateral ventricle
• Communications
• Formation & circulation of CSF
• Applied anatomy
• summary

3. Anatomical positioning of ventricles of brain

5. https://www.youtube.com/watch?v=zqQ6iKw5DjY

6. • https://www.youtube.com/watch?v=zqQ6iKw
5DjY

7. Lateral Ventricles
• Two lateral ventricles
• “C” shaped
• Capacity- 7to10 ml
• Communicates with 3rd
ventricle through
foramen of Monro.
• Lined by ependyma

8. Ventricular System

10. Lateral Ventricle : Parts
• Each consist of
a) central part (body)
b) Anterior horn
c) Posterior horn
d) Inferior horn

11. Left lateral ventricle (lateral view)

12. Central part
• Extent- from interventricular
foramen to splenium of
corpus callosum
• Triangular on coronal
section
• Has – roof, floor &
medial wall

13. Roof:
Under surface of body of
corpus callosum
Floor:(lateral to medial)
- Body of caudate nucleus
- Stria terminalis &
thalamostriate vein
- Upper surface of thalamus
- Choroid plexus
- Upper surface of body of fornix
Medial wall:
- Septum pellucidum

14. Lateral Ventricle - Body

15. Anterior horn
Anterior wall:
Genu of corpus callosum
Roof:
under surface of ant.part
of corpus callosum
Lateral wall:
Head of caudate nucleus
Floor:
Rostrum (upper surface)
Medial wall:
Septum pellucidum
& column of fornix

16. Anterior horn of lateral ventricle
(lateral view)

17. Posterior horn
• Diamond in shape
Roof & Lateral wall:
- Tapetum
Medial wall:
- Bulb of posterior horn
(forceps major)
- Calcar avis (calcarine sulcus)

18. Posterior horn of lateral ventricle
(lateral view)

19. Inferior horn
Extent:
• From the meeting point of
central part & post. horn to
2.5cm behind the temporal
pole
• Largest & longest part
• Collateral trigone
Presenting part:
• Roof
• Floor

20. Roof:
Lateral part- tapetum
Medial part- tail of caudate
nucleus & stria terminalis
Floor:
Laterally- Collateral eminence
(collateral sulcus)
Medially- Hippocampus
Choroid plexus

21. Hippocampus

22. Inferior horn of lateral ventricle (lateral view)

23. Choroid Plexus

24. Choroid plexus (coronal view)

25. Formation & circulation of CSF
Formation:
- choroid plexus
Circulation:
- lateral ventricle – third
ventricle – fourth ventricle
- subarachnoid space &
central canal
Absorption:
- arachnoid granulation –
SSS

26. Dorsal view of choroid plexus in the ventricular system.
Notice the absence of choroid in the aqueduct &
anterior and posterior horns.

27. Applied anatomy
• Ventricular system of brain can be visualized by
- CT Scan
- MRI
- Ventriculography
- Air encephalography (pneumoencephalography)

28. Hydrocephalus

29. In children:
- obstruction of
- Foramen of Monro
- Aqueduct of Sylvius
- Foramen of Magendie & Luschka
In adult:
- Increased ICP
Treatment:
- VP shunt
- Venriculostomy

30. Endoscopic Third Ventriculostomy (ETV)

31. VP Shunt

32. Thank you