The petrous portion of the temporal bone or pyramid is pyramidal and is wedged in at the base of the skull between the sphenoid and occipital bones. Directed medially, forward, and a little upward, it presents for examination a base, an apex, three surfaces, and three angles, and contains, in its interior, the essential parts of the organ of hearing. The petrous portion is among the most basal elements of the skull and forms part of the endocranium.[WP,unvetted]. [ http://en.wikipedia.org/wiki/Petrous_part_of_the_temporal_bone ]

Synonyms: petromastoid part of temporal bone temporal bone petrous part pars petrosa ossis temporalis pars petrosa (os temporale)

This is just here as a test because I lose it

Term information

Subsets

uberon_slim

depicted by

http://upload.wikimedia.org/wikipedia/commons/9/96/Gray137.png

external definition

The petrosal bone arises from the two otic bones on the lateral wall of the chondrocranium and encases the inner ear of mammals. [Bemis_WE, Functional_Anatomy_of_the_Vertebrates:_An_Evolutionary_Perspective, Grande_L, Third_Edition_(2001)_Orlando_Fla.:_Harcourt_College_Publishers, Walker_WF, p.258, see_Liem_KF][VHOG]

has related synonym

petrous bone

petrosal bone

id

UBERON:0001694

taxon notes

derivative of prootic and opisthotic