petrosal sinus


Medical Definition of petrosal sinus 

: either of two venous sinuses on each side of the base of the brain:
a : a small superior sinus that connects the cavernous and transverse sinuses of the same side

called also superior petrosal sinus

b : a larger inferior sinus that is situated in a sulcus on each side formed by the junction of the petrous portion of the temporal bone and the basilar portion of the occipital bone and that extends from the posterior inferior end of the cavernous sinus through the jugular foramen to join the internal jugular vein of the same side

called also inferior petrosal sinus

Learn More about petrosal sinus

Share petrosal sinus

Comments on petrosal sinus

What made you want to look up petrosal sinus? Please tell us where you read or heard it (including the quote, if possible).


involving abstract or general statements

Get Word of the Day daily email!

Test Your Vocabulary

Liar, Liar Quiz

  • alt-5761dbe2ba986
  • Someone who pretends to be sick in order to avoid work is a:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Add Diction

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!