Side view of head, showing surface relations of bones (Pterion labeled at center)
Side view of the skull with arrow pointing to the Pterion
It is the junction between four bones:
- the parietal bone
- the squamous part of temporal bone
- the greater wing of sphenoid bone
- the frontal bone
These bones are typically joined by three cranial sutures:
- the sphenoparietal suture joins the sphenoid and parietal bones
- the coronal suture joins the frontal bone to the sphenoid and parietal bones
- the squamous suture joins the temporal bone to the sphenoid and parietal bones
The pterion is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma. The pterion may also be fractured indirectly by blows to the top or back of the head that place sufficient force on the skull to fracture the pterion.
The pterion receives its name from the Greek root pteron, meaning wing. In Greek mythology, Hermes, messenger of the gods, was enabled to fly by winged sandals, and wings on his head, which were attached at the pterion.
- R.M. McMinn.Last's anatomy regional and applied, 9th edition. Edinburgh (UK): Churchill Livingstone; 1994. Page 645
- Siyan, MA; Louisa J.M. Baillie and Mark D. Stringer (April 2012). "Reappraising the surface anatomy of the pterion and its relationship to the middle meningeal artery". Clinical Anatomy 25 (3): 330–339. doi:10.1002/ca.21232. PMID 21800374.
- Garner, Jeff; Goodfellow, Peter (2004). Questions for the MRCS Vivas. p. 123.
- Weston, Gabriel (22 August 2011). "Mapping the Body: The Temple". The Guardian. Retrieved 4 February 2012, 4 April 2012.
- Anatomy figure: 22:01-04 at Human Anatomy Online, SUNY Downstate Medical Center
- Diagram - look for #24 (source here)