- Source: Mastoid foramen
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.
Structure
The mastoid foramen is a hole in the posterior border of the temporal bone of the skull.
The opening of the mastoid foramen is an average of 18 mm from the asterion, and around 34 mm from the external auditory meatus. It is typically very narrow. This may be around 2 mm.
= Variation
=The position and size of this foramen are very variable. It is not always present. Sometimes, it is duplicated on one side or both sides. Sometimes, it is situated in the occipital bone, or in the suture between the temporal bone and the occipital bone.
Function
The mastoid foramen transmits:
an emissary vein between the sigmoid sinus and the suboccipital venous plexus or the posterior auricular vein.
a small branch of the occipital artery, the posterior meningeal artery, to the dura mater.
References
This article incorporates text in the public domain from page 141 of the 20th edition of Gray's Anatomy (1918)
External links
"Anatomy diagram: 34257.000-1". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2012-07-22.
"Anatomy diagram: 34257.000-2". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2013-06-22.
Akram Abood Jaffar: Personal website, Anatomical variations
Kata Kunci Pencarian:
- Foramen spinosum
- Otot sternokleidomastoid
- Mastoid foramen
- Mastoid part of the temporal bone
- Stylomastoid foramen
- Occipital bone
- Sternocleidomastoid muscle
- Base of skull
- Sigmoid sulcus
- Dura mater
- Occipitomastoid suture
- Outline of human anatomy
