The straight sinus is situated within the dura mater, where the falx cerebri meets the midline of tentorium cerebelli.

[1] It forms from the confluence of the inferior sagittal sinus and the great cerebral vein.

[1] In cross-section, it is triangular, contains a few transverse bands across its interior, and increases in size as it proceeds backward.

[2] The straight sinus allows blood to drain from the inferior center of the head outwards posteriorly.

[1] This article incorporates text in the public domain from page 655 of the 20th edition of Gray's Anatomy (1918)