The mastoid foramen is a hole in the posterior border of the temporal bone.

It transmits an emissary vein between the sigmoid sinus and the suboccipital venous plexus, and a small branch of the occipital artery, the posterior meningeal artery to the dura mater.

The mastoid foramen is a hole in the posterior border of the temporal bone of the skull.

[1] The opening of the mastoid foramen is an average of 18 mm from the asterion,[2] and around 34 mm from the external auditory meatus.

The mastoid foramen transmits: This article incorporates text in the public domain from page 141 of the 20th edition of Gray's Anatomy (1918)