Cerebellar veins

The left half of the tentorium has been removed while preserving a laterally placed tentorial sinus. A large sinus is seen through the right tentorial surface.

The right half of the tentorium has been removed to expose a large inferior hemispheric vein from the suboccipital surface and a smaller superior hemispheric vein from the tentorial surface emptying into the large tentorial sinus.

The superior hemispheric veins, which drain the tentorial surface, are divided into an

Smaller veins from both the left tentorial and suboccipital surfaces join the laterally placed tentorial sinus near the junction of the left transverse and superior petrosal sinuses.

The straight and tentorial sinuses have been removed. The anterior group drains toward the cerebellomesencephalic fissure and the vein of Galen, and the posterior group passes backward to empty into the tentorial sinuses.

The posterior lip of the cerebellomesencephalic fissure has been removed to expose the veins of the superior cerebellar peduncle, which ascend to unite and form the vein of the cerebellomesencephalic fissure that empties into the vein of Galen. A transverse pontine vein and the vein of the cerebellopontine fissure join to form a superior petrosal vein that empties into the superior petrosal sinus.

The posterior lip of the cerebellomesencephalic fissure has been removed to expose the tributaries of the vein of the cerebellomesencephalic fissure and the branches of the SCA.
The paired veins of the superior cerebellar peduncle unite to form the vein of the cerebellomesencephalic fissure that empties into the vein of Galen.

The branches of the SCA within the cerebellomesencephalic fissure have been removed. The paired veins of the superior cerebellar peduncle ascend on the superior cerebellar peduncles and join to form the vein of the cerebellomesencephalic fissure. The veins on the surface of the middle cerebellar peduncle course laterally to join the veins emptying into the superior petrosal sinus.

The left half of the tentorium has been removed while preserving the tentorial sinuses. The anterior group of superior vermian and superior hemispheric veins arise on the upper part of the tentorial surface and ascend to reach the veins exiting the cerebellomesencephalic fissure, which empty into the vein of Galen. The posterior group of superior vermian and superior hemispheric veins arise on the posterior part of the tentorial surface and descend to empty into tentorial sinuses. The inferior hemispheric veins, which arise on the suboccipital surface, also empty into the tentorial sinuses.

Both halves of the tentorium have been removed while preserving the large tentorial sinuses. The superior hemispheric veins from the posterior part of the tentorial surface and the inferior hemispheric veins from the suboccipital surface drain into the paired large tentorial sinus that join the torcula. The veins draining the anterior part of the tentorial surface empty into the tributaries of the vein of Galen.

The largest vein in the fissure is the vein of the cerebellomesencephalic fissure. The internal cerebral veins pass above the pineal to join the vein of Galen.

The veins draining the walls of the cerebellomesencephalic fissure join the vein of Galen, as do the internal cerebral and basal veins.

The vertebral and basilar arteries and their branches course superficial to the veins. The veins on the anterior surface of the pons and medulla and the petrosal surface drain predominantly into the superior petrosal veins, which empty into the superior petrosal sinuses.

The arteries have been removed. The median anterior pontomesencephalic and median anterior medullary veins ascend on the front of the brainstem. The transverse pontine and transverse medullary veins run transversely across the pons and medulla surfaces. The anterior hemispheric veins drain the petrosal surface and commonly empty into the vein of the cerebellopontine fissure, which ascends to join the superior petrosal veins. The vein of the pontomedullary sulcus passes across the pontomedullary junction.

The anterior hemispheric veins drain the petrosal surface and pass forward to empty into the vein of the cerebellopontine fissure or a superior petrosal vein. The vein of the cerebellopontine fissure arises at the lateral apex of the cerebellopontine fissure and crosses the middle cerebellar peduncle, where it is joined by a large transverse pontine vein.

The vein of the cerebellopontine fissure arises from the union of the anterior hemispheric veins at the apex of the cerebellopontine fissure and ascends to be joined by a superior hemispheric vein from the lateral part of the tentorial surface before emptying into the superior petrosal sinus.

The cerebellum has been removed to expose the veins of the superior, inferior, and middle cerebellar peduncles. The vein of the superior cerebellar peduncle ascends to join the vein of the cerebellomesencephalic fissure. The vein of the inferior cerebellar peduncle crosses the peduncle at the inferolateral margin of the fourth ventricle and passes around the lateral recess to join the veins in the cerebellopontine angle. The veins of the cerebellopontine fissure and middle cerebellar peduncle and a transverse pontine vein join to form a superior petrosal vein. The vein of the cerebellomedullary fissure empties into the vein of the middle cerebellar peduncle.

The vein of the cerebellomedullary fissure passes laterally across the lateral recess and empties into the vein of the middle cerebellar peduncle. The latter vein and the vein of the cerebellopontine fissure join to form a large superior petrosal vein. A large anterior hemispheric vein ascends along the petrosal surface.

The veins on the anterior surface of the pons and medulla and the veins of the cerebellopontine fissure and their tributaries empty into the superior petrosal veins.

The median anterior medullary vein and median anterior pontomesencephalic veins course in the midline, but often do not extend along the full length of the pons and medulla.

The vein of the pontomesencephalic sulcus and the transverse pontine veins are transversely oriented.

The veins of the cerebellomedullary fissure join the veins of the middle cerebellar peduncle, which ascends to join the veins of the cerebellopontine fissure.

The veins in the crural and ambient cistern join the basal vein, which empties into the vein of Galen in the quadrigeminal cistern. The basal vein also drains the walls of the temporal horn, which has been opened on the right. An internal occipital vein passes from the calcarine sulcus and occipital lobe to the vein of Galen.

The inferior ventricular vein from the temporal horn and the lateral atrial vein join the basal vein, which also drains the walls of the crural and ambient cisterns. The cerebellomesencephalic fissure, an inferior extension of the quadrigeminal cistern, is drained by tributaries of the vein of Galen.

The veins in the medial portion of the cerebellomesencephalic fissure empty into the vein of Galen and those from the lateral part may join the superior petrosal veins. In this case, the vein of the cerebellomesencephalic fissure is small, resulting in most of the fissure’s drainage being directed laterally through a pontotrigeminal vein, which passes above the trigeminal nerve to empty into a superior petrosal vein formed by a superior hemispheric and transverse pontine vein and the vein of the cerebellopontine fissure.