Third ventricle

Jump to: navigation, search
Brain: Third ventricle
Scheme showing relations of the ventricles to the surface of the brain.
Latin ventriculus tertius cerebri
NeuroNames hier-429
Dorlands/Elsevier v_06/12853453

The third ventricle (ventriculus tertius) is one of four connected fluid-filled cavities comprising the ventricular system within the human brain. It is a median cleft between the two thalami, and is filled with cerebrospinal fluid (CSF).

It is in the midline, between the left and right lateral ventricles.


It communicates with the lateral ventricles anteriorly by the interventricular foramina (of Monro).

It communicates with the fourth ventricle posteriorly by the cerebral aqueduct (of Sylvius).


Developmentally the third ventricle represents the cavity of the diencephalon.


It is bounded by the thalamus and hypothalamus on both the left and right sides. The lamina terminalis forms the anterior wall of the third ventricle.


There are two protrusions on the front of the third ventricle:

In casts of the ventricular system, a small 'hole' may be seen in the body of the third ventricle. This is formed where the two thalami are joined together at the interthalamic adhesion (not seen in all people).

See also

Additional images

External links

nl:Derde ventrikel no:Tredje ventrikkel