What is "pterion"

n. (context anatomy English) The point corresponding with the posterior end of the sphenoparietal suture; known as the weakest part of the skull.

n. the craniometric point in the region of the sphenoid fontanelle

The pterion is the region where the frontal, parietal, temporal, and sphenoid join together. It is located on the side of the skull, just behind the temple.