44 



HITCHCOCK'S ANATOMY 



Fig. 46. 



Left Temporal Bone. 1, Squamous portion. 

 2, Mastoid portion. 3, Petrous portion. 4, Zygo- 

 matic portion. 5, Articulating surface for lower 

 jaw. 6, Temporal ridge. 7, Glenoid fissure. 8, 

 Mastoid foramen. 9, Canal for ear. 10, Groove 

 for digastric muscle. It, Styloid process. 12, Va- 

 ginal process. 13, Glenoid Foramen. 14, Groove 

 for Eustachian tube. 



Fig. 47. 



win 



Left Parietal Bone. 1, 2, 3, 4, Superior, Infe- 

 rior, Anterior, and Posterior surfaces. 5, Ridge 

 for Temporal Fascia. 6, Parietal Foramen. 7 and 

 8, Inferior angles. 



Bone lias an imperfectly circular ou 



of hearing. Directly 

 behind the external ear 

 is felt a hard projection 

 which is the mastoid 

 process of this bone, 

 and serves for the 

 attachment of many 

 muscles, which move 

 the head. And directly 

 in front of the ear is 

 another prominent pro- 

 cess, called the zygo- 

 matic, which articulates 

 with the malar bone, 

 and to which is at- 

 tached one of the ele- 

 vator muscles of the 

 jaw. The two Parie- 

 tal Bones are eminently 

 flat bones of a square 

 shape, forming the es- 

 sential parts of the pro- 

 jections on the back 

 sides of the head, and 

 uniting with each other 

 on the median line, up- 

 on the top of the skull. 

 They join with the 

 frontal bone in front, the 

 temporal bones below, 

 and the occipital bone 

 behind. The Occipital 

 tline, and at its lower 



Whit is the mastoid process ? Where is the zygomatic process ? Give the form of 

 the Parietals. What is the outline of the Occipital Bone ? What is the large orifice in 

 its lower part for? Give the position and general outline of the Sphenoid Bone. With 

 what bones docs this articulate? 



