SUPERFICIAL TEMPORAL ARTERY. 607 



cartilaginous bands in those parts of the wall ; but at the posterior form. 

 aspect the cartilages are absent, and the wall is flat and mem- 

 branous. 



The cervical part of the trachea is very moveable, and has the Cervk-ai 

 following relative position to the surrounding parts. Covering it a^ion^t 

 in front are the depressor muscles of the hyoid bone, with the deep muscfes 

 cervical fascia : beneath those muscles is the inferior thyroid plexus 

 oi veins ; and near the larynx is the isthmus of the thyroid body. 

 Behind the tube is the oesophagus, with the recurrent laryngeal aud vessels, 

 nerves. On each side are the common carotid artery and the 

 thyroid body. 



The (ESOPHAGUS, or gullet, reaches from the pharynx to the (Esophagus 

 stomach. It commences, like the trachea, opposite the lower part occupies 

 of the sixth cervical vertebra, and ends opposite the tenth dorsal 

 vertebra. The tube reaches through part of the neck, and through 

 the whole of the thorax. Its length is about nine inches. length. 



In the neck its position is behind the trachea till near the thorax Position in 

 where it projects to the left side of the air tube, and touches the uec ' 

 thyroid body and the thoracic duct. Behind the oesophagus are and rela- 

 the longi colli muscles. On each side is the common carotid artery, Ion "' 

 the proximity of the left being greater, in consequence of the 

 projection of the oesophagus towards that side. 



The structure of the oesophagus will be examined in the dissection 

 of the thorax. 



Directions. The lower part of the neck will now be left for some 

 days, so that the dissector should stitch together the flaps of skin if 

 they remain, and carefully wrap up the part and apply preservative. 



SECTION VII 



THE PTERYGO-MAXILLARY REGION. 



In this region are included the muscles superficial to and beneath Contents of 

 the ramus of the lower jaw, together with the temporo-niaxillary the n & Qn - 

 articulation. In contact with the muscles (pterygoid) beneath the 

 jaw, are the internal maxillary blood-vessels, and the inferior 

 maxillary trunk of the fifth nerve. 



Dissection. The masseter muscle, which is superficial to the Dissection, 

 bone, has been partly laid bare in the dissection of the face. To 

 see it more fully, the branches of the facial nerve and the transverse 

 facial artery should be cut through and turned backwards, and the 

 fascia cleaned off the surface of the muscle. 



Should there be any tow or cotton-wool left in the mouth let it 

 be removed. 



The MASSETER (fig. 203, p. 553) rises by a flattened tendon from Masseter 

 the lower border of the zygomatic arch, including a small portion of 

 the malar process of the superior maxilla, and by fine fleshy fibres 

 from the deep surfaces of the zygomatic process and the malar bone. 



It i.s inwrit.-d into the whole of the outer surface of the coronoid ail(i inser- 

 tion ; 



