2 HEAD AND NECK 



their terminations. On the third day the superficial muscles 

 must be reflected, and the deeper vessels and nerves must 

 be exposed and cleaned, and the auricle should be examined 

 and dissected. On the fourth day the body is placed upon 

 its back, and the dissectors should commence the dissection 

 of the posterior triangle of the neck they must complete 

 that part of the dissection jn three days. On the seventh 

 day they should complete the examination of the scalp. 

 The eighth day should be devoted to a final study of the 

 brachial plexus, in association with the dissectors of the upper 

 extremity. 



FACE AND FRONTAL REGION OF HEAD. 



The dissectors should commence the study of the face and 

 frontal region by an examination of the bony prominences 

 and ridges in the area to be dissected. 



In the centre of the facial area is the prominent outer 

 portion of the nose, consisting of a lower mobile part, formed 

 mainly by skin and cartilage, and an upper rigid portion, 

 formed by the nasal bones and the frontal processes of 

 the maxillae. At the sides of the nose are the sockets 

 for the eyeballs, each of which is bounded above by the 

 supra-orbital margin of the frontal bone and below by the 

 orbital margins of the maxilla and the zygomatic bone 

 (O.T. malar). The supra- and infra-orbital margins meet 

 laterally in the region of the cheek bone (zygomatic). From 

 the posterior part of the zygomatic bone, the zygomatic 

 arch, formed partly by the zygomatic and partly by the 

 temporal bone, extends barkwards to the ear. Above the 

 zygomatic arch is the region of the temporal fossa, which 

 is bounded superiorly by the temporal line. The line 

 terminates anteriorly in the lateral part of the supra-orbital 

 margin. Above the medial part of the supra-orbital margin 

 the superciliary arch can be felt, and at a higher level, 

 above the lateral part of the supra-orbital margin, lies the 

 frontal tuberosity. The region above the nose and between 

 the medial ends of the superciliary arches is the glabella. 



Below the zygomatic arch lies the ramus of the mandible, 

 covered by the masseter muscle ; and extending forwards 

 from the lower end of the ramus is the body of the mandible. 

 A line dropped vertically through the junction of the medial 



