A craniometric point in the region of the sphenoid fontanelle, at the junction of the greater wing of the sphenoid, the squamous temporal, the frontal, and the parietal bones; it intersects the course of the anterior division of the middle meningeal artery. [G. pteron, wing]
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pter·i·on 'ter-ē-.än n the point on each side of the skull where the parietal and temporal bones meet the greater wing of the sphenoid
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n.
the point on the side of the skull at which the sutures between the parietal, temporal, and sphenoid bone meet.
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pte·ri·on (tērґe-on) [Gr. pteron wing] [TA] a point at the junction of the frontal, parietal, temporal, and greater wing of the sphenoid bone; about 3 cm posterior to the external angular process of the orbit.Medical dictionary. 2011.