LECTURE II. 



37 



the occijoital bone, and the wings, on the other hand, which 

 assist in closing the orbits and the temporal fossae, forming side 

 pieces, and at least tending towards the formation of an arch. 

 Fig. 4. Base of skull viewed externally. 



a. The palatine process of the superior maxillary forms with d. the hori- 

 zontal plate of the palate bone, the bony palate. 6. Zygomatic process of 

 the superior maxillary forms with c. the zygoma, and g. the zygomatic pro- 

 cess of the temporal bone, the zygomatic arch. e. Temporal fossa, formed 

 chiefly by the greater wing of the sphenoid. /. Posterior nasal spine, h. 

 Vomer, i. Body of the basilar bone, formed of the confluent bodies of the 

 sphenoid bone (in front) and the occipital bone. k. Styloid process of the 

 temporal bone. I. Glenoid fossa for the condyle of the lower jaw. m. Py- 

 ramid of the petrous portion, n. Mastoid process of the temporal bone, 

 o. Articular surfaces of the occipital bone. p. Posterior inferior angle of parietal 

 bone. q. Lambdoid suture, r. Foramen magnum, s. Squama of the occi- 

 pital bone. t. Inferior curved line. • u. Occipital crest, v. Superior curved 

 line. w. Occipital protuberances. 



The vault of the cranium is completed by the arched bones 

 termed the temporal, parietal, and frontal, which are joined to- 

 gether by sutures. It is important to know the course of these 

 sutures. On looking at the skull from above, there is seen on 

 the vertex a transverse suture which separates the frontal from 



