The transverse cerebral fissure is the horizontal gap between the underside of the cerebrum and the structures below it: the cerebellum behind and the roof of the diencephalon in front. The tentorium cerebelli lies in its back part. Its central part, below the fornix and above the third ventricle roof, carries the tela choroidea and the internal cerebral veins.
| Location | Between the cerebral hemispheres above and the cerebellum and diencephalon below |
|---|---|
| Connections |
|
| Blood Supply | Posterior cerebral artery (medial posterior choroidal branches) |
Separates the cerebrum from the cerebellum and diencephalon and carries the vessels and pia that form the choroid plexus.
This fissure provides surgical access to the pineal region and posterior third ventricle. The great cerebral vein and internal cerebral veins run here, so tumours in this area are surgically demanding. It explains how the choroid plexus of the third and lateral ventricles is formed from invaginated pia.
Tumours around the posterior end of the fissure that may block cerebrospinal fluid flow and cause hydrocephalus.
A rare congenital vascular malformation in this region that can cause heart failure and hydrocephalus in infants.
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