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'''Sigmoid Sulcus''' is a structure found in the human [[skull]]. It is a groove or indentation that houses the sigmoid sinus, a venous sinus that drains blood from the brain. The sigmoid sulcus is located in the posterior cranial fossa, near the [[temporal bone]] and [[occipital bone]].

==Etymology==
The term "sigmoid" is derived from the Greek word "sigma," which refers to the letter S. This is due to the S-shaped curve of the sigmoid sinus, which is housed in the sigmoid sulcus. "Sulcus" is a Latin term that means "groove" or "furrow."

==Anatomy==
The sigmoid sulcus begins at the [[internal acoustic meatus]], a canal within the temporal bone, and ends at the [[jugular foramen]], an opening between the temporal and occipital bones. It forms part of the boundary of the posterior cranial fossa, which contains the [[cerebellum]], [[brainstem]], and related structures.

The sigmoid sulcus is not a straight groove but rather follows a curved path, similar to the letter S. This is due to the shape of the sigmoid sinus, which it houses. The sigmoid sinus is a venous sinus that drains blood from the brain and delivers it to the [[internal jugular vein]].

==Clinical Significance==
The location and structure of the sigmoid sulcus can be important in various medical procedures and conditions. For example, it can be involved in surgeries to remove [[tumors]] in the posterior cranial fossa. It can also be affected by conditions that cause increased pressure within the skull, such as [[hydrocephalus]] or [[brain tumors]].

==Related Terms==
* [[Sigmoid sinus]]: A venous sinus that drains blood from the brain and is housed in the sigmoid sulcus.
* [[Venous sinus]]: A channel for venous blood, often found in the brain.
* [[Posterior cranial fossa]]: A depression in the skull that houses the cerebellum, brainstem, and related structures.

[[Category:Anatomy]]
[[Category:Skull]]
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Sigmoid sulcus - Revision history

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