The internal cerebral veins (veins of Galen; deep cerebral veins) drain the deep parts of the hemisphere and are two in number; each is formed near the interventricular foramen by the union of the terminal and choroid veins.

They run backward parallel with one another, between the layers of the tela chorioidea

Tela chorioidea

Tela chorioidea is a structure found in the ventricles of the brain:Types include:* Tela chorioidea of the third ventricle* Tela chorioidea of the fourth ventricle* Tela chorioidea of the lateral ventricle...

 of the third ventricle

Third ventricle

The third ventricle 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 ....

, and beneath the splenium

Splenium

The posterior end of the corpus callosum is the thickest part, and is termed the splenium .It overlaps the tela chorioidea of the third ventricle and the mid-brain, and ends in a thick, convex, free border....

 of the corpus callosum

Corpus callosum

The corpus callosum , also known as the colossal commissure, is a wide, flat bundle of neural fibers beneath the cortex in the eutherian brain at the longitudinal fissure. It connects the left and right cerebral hemispheres and facilitates interhemispheric communication...

, where they unite to form a short trunk, the great cerebral vein; just before their union each receives the corresponding basal vein

Basal vein

The basal vein is formed at the anterior perforated substance by the union of* a small anterior cerebral vein which accompanies the anterior cerebral artery and supplies the medial surface of the frontal lobe by the fronto-basal vein....

.

External links

• Diagram at radnet.ucla.edu