SALIVARY GLANDS. 



203 



tion runs forward over the cheek and opens on the inside 

 of the cheek. It is hard to trace in the rabbit. Find it 

 in the dog, slit into it with fine scissors, and push a black 

 bristle forward through it to find its opening in the mouth. 



2. Just back of the angle of the lower jaw observe a 

 roundish body, the Submaxillary Salivary Gland. In the dog 

 trace its duct as in the case of the parotid. 



3. Observe the muscle which covers the outside of the 

 back part of each lower jaw. This is the Masseter Muscle. 

 Place the fingers on the angle of your own jaw, and note the 



Mucous Membrane 



Duct of Gland 



Secreting Cells 



Fig. 58. Diagram of a Salivary Gland. (After Landois & Stirling.) 



action of the masseter muscle in shutting the teeth firmly 

 together. In the rabbit note the attachment of the masse- 

 ter to the under edge of the cheek-bone. Trim the muscle 

 entirely away. 



4. After removing the submaxillary glands a muscle will 

 be found on each side, having its origin on the inside of each 

 half-jaw near their junction. These are the Digastric Muscles ; 

 they depress the lower jaw. Cut away all the muscles and 

 other connection, and remove the whole of the lower jaw. 



