Definition

Noun: * A venous sinus of the dura mater: The tentorial sinus is an unpaired (single) venous channel within the dura mater, the tough outermost membrane surrounding the brain. It is specifically associated with the tentorium cerebelli, a fold of dura mater that separates the cerebrum from the cerebellum.

Usage Notes

• This is a highly specialized anatomical term used primarily in medical, biological, and neuroscientific contexts.
• It refers to a specific structure involved in draining deoxygenated blood from the brain.
• The term is almost always used in its full form, "tentorial sinus," to avoid confusion with other dural venous sinuses.

Examples

• Anatomical Description:
  • The tentorial sinus runs along the base of the tentorium cerebelli.
  • Imaging revealed an anomaly in the tentorial sinus.
• Clinical Context:
  • Thrombosis of the tentorial sinus is a rare but serious condition.
  • The surgeon carefully avoided the tentorial sinus during the procedure.

Advanced Usage

• The tentorial sinus is also known clinically and in some anatomical texts as the sinus rectus (straight sinus). However, "tentorial sinus" explicitly references its anatomical location.
• It is often discussed in relation to the confluence of sinuses (torcular herophili), where it typically drains.

Variants and Related Words

• Straight Sinus (n): A direct synonym for the tentorial sinus.
• Dural Venous Sinus (n): The general category of venous channels to which the tentorial sinus belongs. Other examples include the superior sagittal sinus and transverse sinus.
• Tentorium Cerebelli (n): The dura mater fold that gives the tentorial sinus its name.

Synonyms

• Straight sinus

Related Terms (Anatomical)

• Confluence of sinuses: The point where several dural sinuses, often including the tentorial sinus, meet.
• Great cerebral vein (of Galen): A major vein that typically empties into the anterior end of the tentorial sinus.

Noun

1. an unpaired sinus of the dura mater