216 Mammalia. 



tionally more developed than the biting muscles, e.g., the 

 Temporales. 



Dissection of Gland Duct, I^erves, and Muscles just 

 Internal to the Angle of the Jaw. The Student wiU 

 now turn the Head partially over, so that it rests on the side of 

 the nose ; and placing a block under the angle of the jaw, will 

 strain the Larynx and QEsophagus over it, hooking them down 

 to the table by means of a chain and hooks. In this way the 

 Submaxillary Gland will be apparent, placed close below and 

 behind the Parotid, on the outer side of the Pharynx ; also 

 the Paroccipital process, with a sharply defined muscle* pro- 

 ceeding therefrom in the direction of the lower jaw, beyond 

 the angle ; and lastly, a fleshy muscle extending all along 

 the inner side of the ramus and angle of the jaw. These, 

 together with the Duct of the Submaxillary Gland, will form 

 our next objects of dissection. 



The submaxillary duct will be found on the continuation of 

 a line drawn from the extreme anterior margin of the orbit to 

 the angle of the jaw : hence in dissecting away the gland- 

 lobules from the fat and mucous membrane, care must be taken 

 to avoid cutting across the duct ; the best way to proceed being, 

 first to dissect the mucous membrane, &c., in one sheet away 

 from the muscle lying within the jaw, and reflect it ; and then 

 to stretch the sheet of membrane thus reflected, by which 

 means the vessels and ducts ramifying in it may be readily 

 detected. Proceeding from the middle of the gland in the 

 direction indicated will be seen a pinkish aggregation of lines 

 and vessels ; this requires special and careful investigation, 

 for, at the final reunion of the ducts from the lobules, just 

 where the duct of Wharton commences, will be easily seen a 

 nerve ganglion of grey mattery as large as a medium-sized pin's 

 head ; about one-eighth of an inch from, and rather larger 



* The Digastric muscle. 



