Groove for sigmoid sinus

Groove for Sigmoid Sinus is a structure found in the human anatomy, specifically within the cranial region. It is a groove or channel that houses the sigmoid sinus, a venous sinus situated within the dura mater, the outermost layer of the meninges that cover the brain and spinal cord.

Anatomy[edit | edit source]

The groove for sigmoid sinus is located on the interior surface of the mastoid part of the temporal bone. It begins near the internal acoustic meatus, a canal within the petrous part of the temporal bone, and extends downward to the jugular foramen, an opening that allows passage of the internal jugular vein and several cranial nerves.

The sigmoid sinus, which lies within this groove, is one of the dural venous sinuses that drain blood from the brain towards the heart. It receives blood from the transverse sinus and continues as the internal jugular vein.

Clinical Significance[edit | edit source]

Due to its location and the vital structures it houses, the groove for sigmoid sinus can be involved in various medical conditions. For instance, trauma to the area can lead to thrombosis or clotting within the sigmoid sinus, potentially causing cerebral venous sinus thrombosis. Infections can also spread from the middle ear to the sigmoid sinus, leading to sigmoid sinusitis or sigmoid sinus diverticulum.