Injuries like this usually happen to the thin area in the temple called the "pterion". From Wordnik.com. [The Full Feed from HuffingtonPost.com] Reference
Fridays 8pm - 11pm on WFMU 91.1 fm 90.1 fm whitney music box (Jim Bumgardner) pterion. From Wordnik.com. [WFMU's recent playlists] Reference
One, the pterion ossicle, sometimes exists between the sphenoidal angle of the parietal and the great wing of the sphenoid. From Wordnik.com. [II. Osteology. 5a. 6. Ethmoid bone] Reference
At the tip of the great wing is a triangular portion, bevelled at the expense of the internal surface, for articulation with the sphenoidal angle of the parietal bone; this region is named the pterion. From Wordnik.com. [II. Osteology. 5a. 5. The Sphenoid Bone] Reference
In order to mark out the lateral cerebral (Sylvian) fissure a point, termed the Sylvian point, which practically corresponds to the pterion, is defined 35 mm. behind and 12 mm. above the level of the frontozygomatic suture; this point marks the spot where the lateral fissure divides. From Wordnik.com. [XII. Surface Anatomy and Surface Markings. 2. Surface Markings of Special Regions of the Head and Neck] Reference
The squamosal suture arches backward from the pterion and connects the temporal squama with the lower border of the parietal: this suture is continuous behind with the short, nearly horizontal parietomastoid suture, which unites the mastoid process of the temporal with the region of the mastoid angle of the parietal. From Wordnik.com. [II. Osteology. 5c. The Exterior of the Skull] Reference
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