- Some of the tentorial sinuses can be seen through the tentorial surface.
- Veins from both the cerebrum and cerebellum empty into the tentorial sinuses.
- The veins in the quadrigeminal cistern and the cerebellomesencephalic fissure empty into the vein of Galen and its tributaries.
- The inferior hemispheric veins from the suboccipital surface cross the posterior part of the tentorial surface to empty into one of the tentorial sinuses with some of the superior hemispheric veins.
- Two veins from the right posterior temporal lobe empty into the transverse sinus.
- A complex and variable group of venous sinuses course within the tentorium and empty into the straight, transverse, and superior petrosal sinuses.
- The veins draining the suboccipital surface and posterior part of the tentorial surface empty into the tentorial sinuses.
- The majority of veins from the upper part of the tentorial surface drain toward the cerebellomesencephalic fissure and empty into tributaries of the vein of Galen.
- Some veins from the lateral part of the tentorial surface may empty into the superior petrosal sinus.
- The sinuses in the tentorium receive drainage from both the cerebrum and cerebellum.
- Veins from the lateral and inferior surfaces of the cerebral hemisphere pass toward, but often turn medially above the transverse sinus to join the tentorium sinuses that empty into the transverse sinus.
- The inferior hemispheric veins from the suboccipital surface ascend toward, but often pass below the transverse sinus to empty into the tentorial sinuses.
- A mastoidectomy has been completed to expose the sigmoid sinus and jugular bulb.
- The temporal lobe has been elevated to show a group of veins that pass from the lower surface of the cerebral hemisphere to the tentorial sinuses.
- Two large lateral cerebral veins empty into the right transverse sinus, but the more medial veins exposed by eliminating the temporal lobe empty into tentorial sinuses.
- The posterior part of the right temporal lobe has been elevated to show the complex of veins on the inferior surface of the hemisphere that empty into the tentorial sinuses.
- The right half of the tentorium has been opened while preserving a large tentorial sinus, which receives drainage from the cerebrum and cerebellum.
- The temporal and occipital lobes have been preserved on the left side.
- The paired veins of the superior cerebellar peduncle ascend to join and form the vein of the cerebellomesencephalic fissure, which empties into the vein of Galen.
Tentorial surface and cerebellomesencephalic fissure
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
- Anterior group, which empties into the Galenic system,
- Posterior group, like the vein shown, which empties into the tentorial sinuses.
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 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.
Abbreviation
Abbreviation | Full Form | Abbreviation | Full Form | Abbreviation | Full Form |
A. | Artery | Int. | Internal | Quad. | Quadrigeminal |
A.I.C.A. | Anteroinferior cerebellar artery | Interped. | Interpeduncular | Retrot. | Retrotonsillar |
Ant. | Anterior | Jug. | Jugular | Sag. | Sagittal |
Atr. | Atrial | Lat. | Lateral | S.C.A. | Superior cerebellar artery |
Bas. | Basilar | Lig. | Ligament | Seg. | Segment |
Bivent. | Biventral | Marg. | Marginal | Sig. | Sigmoid |
Br. | Bridging | Med. | Medial, medullary | Str. | Straight |
Carotid | Carotid | Mes. | Mesencephalic | Sulc. | Sulcus |
Cav. | Cavernous | Mid. | Middle | Sup. | Superior |
Cer. | Cerebellar, cerebellum | N. | Nerve | Supracol. | Supracolliculate |
Cer. Med | Cerebellomedullary | Occip. | Occipital | Supraton. | Supratonsillar |
Cer. Mes. | Cerebellomesencephalic | Olf. | Olfactory | Temp. | Temporal |
Cer. Pon. | Cerebellopontine | P.C.A. | Posterior cerebral artery | Tent. | Tentorial |
Ch. | Choroidal | Ped. | Peduncle | Ton. | Tonsillar |
Cist. | Cistern | Pet. | Petrosal | Trans. | Transverse |
CN | Cranial nerve | P.I.C.A. | Posteroinferior cerebellar artery | Trig. | Trigeminal |
Comm. | Communicating | Pon. | Pontine, ponto | V. | Vein |
Condylar | Condylar | Pon. Med. | Pontomedullary | Ve. | Vermian |
Em. | Emissary | Pon. Mes. | Pontomesencephalic | Vel. | Velum |
Fiss. | Fissure | Pon. Trig. | Pontotrigeminal | Vent. | Ventricle |
Hem. | Hemispheric | Post. | Posterior | Vert. | Vertebral |
Inf. | Inferior | ㅤ | ㅤ | ㅤ | ㅤ |
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