sigmoid groove


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groove for sig·moid si·nus

[TA]
a broad groove in the posterior cranial fossa, first situated on the lateral portion of the occipital bone, then curving around the jugular process on to the mastoid portion of the temporal bone, and finally turning sharply on the posterior inferior angle of the parietal bone and becoming continuous with the transverse groove; it lodges the transverse sinus.

sigmoid groove

The groove on the inner surface of the mastoid portion of the temporal bone. It transmits the transverse sinus.
See also: groove