76 



THE SKELKTOX 



The bones visible in this view of the skull are: the frontal, nasals, lachrymals, 

 orbital surfaces of the lesser and the greater wings, and a portion of the body of the 

 sphenoid, the ossa plana of the ethmoid, and the orbital })rocesses of the palate 

 bones, the malars, maxilla?, inferior turljinals, and the mandible. 



The foramina are: the supraorbital, infraorbital, optic, temporal, and mental; 

 the lachrymal duct; the malar and ethmoidal canals; and the spheno-maxillary 

 and sphenoidal fissures. 



Tlic orbits are tw(^ cavities of pyramidal sha23e, which lodge the eyeball and its 



Fig. 84. — The .Skull. (Norma facialis.) 



Zygomaticus 



Zygomaticus 

 minor 



SURFACE COVERED 8Y 

 occipito-frontaiis 



Corrugator 

 supereilii 



Teudo oeuli 

 Orbicularis 



palpebrarum 

 Levator labii supe- 



rioris alaeque nasi 



Levator labii 

 superioris 



Levator anguli oris 

 Compressor naris 



Depressor alae nasi 

 Orbicularis oris 



associated muscles, nerves, and vessels. The apex of each orbit corresponds to 

 the optic foramen, a circular orifice which transmits the optic nerve and oph- 

 thalmic artery. The base looks forwards and outAvards. It is formed by the 

 frontal bone al)ove, the nasal process of the maxilla on the inner side, the malar 

 bone externally, and below ]>y the malar and bodv of the maxilla. The following 

 points are seen around the base:— The suture between the external angular process 

 of the frontal bone and the malar; the supraorbital notch (sometimes a complete 



