The third ventricle is one of the four CSF-filled cavities that together comprise the ventricular system.
It is a median cleft between the two thalami and is bounded laterally by them and the hypothalamus. It's anterior wall is formed by the lamina terminalus. There are two protrusions on the anterior surface of the third ventricle:
In some patients, the two thalami meet forming the interthalamic adhesion and where casts are made of the ventricular system, a hole is seen through the third ventricle.
- Gray's Anatomy 39th Edition, Elsevier
- Thieme Atlas of Anatomy (Head and Neuroanatomy): ISBN 3131421215