54 SUPERIOR REGION OF THE SKULL. 



Across the upper part of the face is an irregular suture, the trans- 

 verse, which connects the frontal bone with the nasal, superior maxillary, 

 lachrymal, ethmoid, sphenoid, and malar bones. The other sutures 

 axe too unimportant to deserve particular names or description. 



REGIONS OF THE SKULL. 



The skull, considered as a whole, is divisible into four regions, a 

 superior region, or vertex ; a lateral region ; an inferior region, or 

 base ; and an anterior region, the face. 



Fig. 28.* 



The SUPERIOR REGION, or vertex of the skull, is bounded anteriorly 

 by the frontal eminences ; on each side by the temporal ridges and 

 parietal eminences ; and behind by the superior curved line of the 



* A front view of the skull. 1 . The frontal portion of the frontal bone. 

 The 2, immediately over the root of the nose, refers to the nasal tuberosity ; 

 the 3, over the orbit, to the supra-orbital ridge. 4. The optic foramen. 5. The 

 sphenoidal fissure. 6 The spheno- maxillary fissure. 7- The lachrymal fossa in 

 the lachrymal bone, the commencement of the nasal duct. The figures 4, 5, 6, 

 7, are within the orbit. 8. The opening of the anterior nares, divided into two 

 parts by the vomer ; the number is placed upon the latter. Q. The infra-orbital 

 foramen. 10. The malar bone. 1 1 . The symphysis of the lower jaw. 12. The 

 mental foramen. 13. The ramus of the lower jaw. 14. The parietal bone. 

 15. The coronal suture. 16. The temporal bone. 17- The squamous suture. 

 18. The upper part of the great ala of the sphenoid bone. 19. The commence- 

 ment of the temporal ridge. 20. The zygoma of the temporal bone, assisting 

 to form the zygomatic arch. 21. The mastoid process. 



