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BONES. 55
Remarks.—The basilar and condyloid portions of this bone, being
so nearly connected with the mouth and associate pai-ts, claim special
attention.
The basilar process forms the roof of the pharynx, and is situated on
a level with the posterior nares, and in surgical operations may be
reached through the nose or through the oral cavity.
Hydatid or exostosed cysts and other enlargements within the ante-
rior condyloid foramen, producing pressure upon the hyjjoglossal nerve,
would cause paralysis, atrophy, or deflection of the tongue.
The Temporal Bone (Fig. 17) is situated at the side and base of the
brain-case. It articulates in front with the great wing of the sphe-
noid bone, above with the parietal bone, behind with the lateral portion
of the occipital bone, and at the base of its petrous portion is wedged
Fig. 17.

Left Temporal Rone, outer surface.
in between the basilar process of the occipital and the great wing of the
sphenoid bone. By its outer surface it assists in the formation of the
temporal and the zygomatic fossae and the zygomatic arch ; by its under
surface it forms part of the roof of the parotid region ; and by its inner
surface it forms part of the middle fossae of the brain-case. For con-
venience of description this bone is generally divided into three portions
—viz. the squamous (scale), the mastoid (nipple), and the petrous (rock).