Dural venous sinuses

The sinus of the dura mater are venous sinuses of the brain. They are erroneously referred to as venous sinus. Unlike veins lack the sheath of muscle ( tunica media ), and the venous valves. They consist of an endothelialized duplication of the dura mater ( dura mater) and are therefore starrwandig. Thus they lack the ability to carry blood in a particular direction. The direction of flow of the blood will depend on the position of the head. They collect the deoxygenated blood from the veins of the brain, meninges, skull bones and eyes.

Anatomical subdivision

The superior sagittal sinus runs in an imaginary center line under the skull along the so-called brain sickle ( falx cerebri). The inferior sagittal sinus runs in the free edge of the falx above the bar and flows together with the vena cerebri magna into the straight sinus. This goes straight back to the confluence of the sinuses, opens into the well of the light coming from above the superior sagittal sinus. Also attached here is the occipital sinus. The paired sine transversi lead the blood from the confluence further to the rear base of the skull, where they wind up in the course of an S-shape and from there called the sigmoid sinus. Finally, they open into the deep veins of the neck. The cavernous sinus is a sponge-like network that is on the sphenoid bone and is connected to the rest of the venous sinus system in each case by a superior and inferior petrosal sinus on each side.

Pathology

The sinus may bleed heavily after head injury. Clot in them are called sinus thrombosis.