part of part of skull anatomical point porion http://upload.wikimedia.org/wikipedia/commons/a/a7/Gray189.png The porion is the point on the human skull located at the upper margin of each ear canal (external auditory meatus, external acoustic meatus). It underlies the tragus. The anatomical landmark has significance in biological anthropology and craniometry. FMA:264711 UBERON:0013436 Wikipedia:Porion