Dural venous sinuses, Ankur Saxena
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Human Cranial, Dural, Venous Sinuses, Undergraduate medical students
- 1. Dural Venous Sinuses
- 2. • Venous channels situated between inner & outer layers of Dura mater • Drain the venous blood of the brain & bones of the skull. • Transmit the venous blood to the internal jugular vein. • Communicates with the internal vertebral venous plexus through the foramen magnum • Also communicates with the scalp veins through the emissary veins • Valveless
- 3. The Dural sinuses maybe divided into 2 groups • 1- single: Superior saggital , Inferior saggital & Occipital • 2- Paired: Spheno-parietal , Cavernous , Superior petrosal , Inferior petrosal & Sigmoid.
- 4. 1- Superior sagittal sinus Attachments. • Begins in front at the frontal crest & ends behind at the internal occipital protuberance • The superior sagittal sinus receives the following : • 1- Superior cerebral veins • 2- dipolic veins • 3- Emissary veins • 4- arachnoid granulation • 5- meningeal veins
- 5. 2 – Inferior sagittal sinus • It occupies the posterior 1/2 or 2/3 of the lower free border of falx cerebri. • It ends posteriorly by joining the straight sinus • It receives cerebral veins from the medial surface of the cerebral hemisphere
- 6. 3- Straight sinus • It lies at the junction of the falx cerebri and tentorium cerebelli It receives : • 1- inferior sagital sinus • 2- great cerebral vein • It ends at internal occipital protuberance by becoming the left transverse sinus
- 7. 4- Transverse sinus • Paired sinus • It extends horizontally in the attached border of tentorium cereblli. • The right sinus receive the superior sagittal sinus however ,the left sinus receive the inferior sagittal sinus • Each sinus end by becoming continuous with sigmoid sinus • Transverse sinus receive the following tributaries : • 1- Superior petrosal sinus • 2- cerebellar veins • 3- Occipital diploic vein.
- 8. 5- occipital sinus • It is the smallest dural sinus & is situated in the attached margin of the falx cerebelli • It continuates with the internal vertebral plexus
- 9. 6- Spheno-parietal sinus • paired sinus • It lies on the edge of the lesser wing of sphenoid 7- superior petrosal sinus • It is a paired sinus situated on the upper border of the petrous bone • It lies at the attachment border of tentorium cerebelli • It continues with cavernous sinus anteriorly & with transverse sinus posteriorly.
- 10. 8- Inferior petrosal sinus • It is a paired sinus situated between the petrous bone & basilar part of occipital bone • It communicates with cavernous sinus anterior & with superior bulb of internal jugular vein posterior
- 11. 9- Cavernous sinus • Position: it lies on the side of the body of sphenoid • Relation: A- Medially • Sphenoid air sinus • Pituitary gland B- Laterally • Trigeminal ganglion • Uncus of temporal lobe C- Nerves in its lateral wall • 3RD cranial nerve • 4th cranial nerve • Ophthalmic division of 5th cranial nerve maxillary division of 5th cranial nerve D- Structures within its cavity • Internal carotid artery • Abducent nerve
- 12. • Tributaries of cavernous sinus : A- Anteriorly • 1- Ophthalmic vein • 2- Spheno-parietal sinus B- Posteriorly • Superior petrosal sinus • Inferior petrosal sinus C- Medially • Anterior & posterior intercavernous sinuses
- 13. D- Superior • Superficial middle cerebral vein • Veins from inferior surface of brain E- Inferior • Emissary vein through the carotid canal which connects the sinus with internal jugular vein • Emissary vein through the foramen ovale which connects the sinus with pterygoid venous plexus
- 14. • The cavernous sinus communicates with the veins of the face through 2 routes : • Superior ophthalmic veins, • Deep facial vein, • pterygoid plexus of veins & • emissary vein through the foramen Ovale.
- 15. 10- Sigmoid sinus • It is wide S- shaped sinus which begins at the lateral & of transverse sinus . • The sinus ends by passing through the jugular foramen where it becomes continues with internal jugular vein It has the following tributaries • Posterior condylar emissary vein • Mastoid emissary vein
- 16. • Applied Anatomy : • Cavernous Sinus Thrombosis. • Meningioma.