45 APPENDIX. 



opening of the duct is seen. Enlarge the opening and insert a black 

 bristle as far as possible. 



3. Remove the skin and the skin-muscles from the side of the 

 face, beginning at the caudal end and working craniad. At the 

 cranial border of the carotid on the ventral side look carefully for the 

 parotid duct with the bristle in it. The duct is then easily traced 

 by the removal of the skin and muscles. Study the parotid gland 

 (Fig. 131, 10, p. 322). 



4. Remove the facial vein (Fig. 131, b and c) and lymphatic 

 gland (Fig. 131, ij) covering the submaxillary gland (Fig. 131, n) 

 and clean its outer surface. Raise it and find the submaxillary duct 

 leaving its inner surface. Reflect the digastric and mylohyoid 

 muscles and trace the duct to the oral mucosa. The remainder of 

 its course is shown by the bristle on the inside of the mouth. 



5. The sublingual gland is uncovered in dissecting the submaxil- 

 lary. Its duct is seen by the side of the submaxillary. It may be 

 pricked near the gland and a bristle passed to its opening. 



6. The infraorbital gland. Expose it by removal of the zygo- 

 matic arch and masseter muscle. Find its duct by dissecting apart 

 the lobules at its ventral end. Prick the duct and insert a bristle to 

 find its inner opening. 



7. The molar gland. Find it by raising the orbicularis oris of 

 the lower lip. By raising its ventral border and dissecting between 

 it and the mucosa the ducts may be found and perhaps pricked and 

 bristles inserted. 



II. The mouth-cavity. Study the general description (p. 221); 

 the lips and the cheek. Then remove the masseter muscle and the 

 caudal part of the zygoma. Cut through the mandible between the 

 first premolar and the canine tooth. Then disarticulate the mandi- 

 ble, cut the cheek and also the mylohyoid muscle and oral mucosa 

 parallel to the medial border of the mandible, and remove the mandi- 

 ble with the parts thus left attached to it. The organs in the 

 mouth-cavity are thus left exposed and should be studied. To 

 demonstrate the incisive ducts (p. 222) pass a bristle into them. 



The teeth (p. 224). These should be studied on a skull in 

 which the roots of the teeth have been laid bare by means of the 

 bone-forceps, as in Figs. 93 and 94. 



The tongue (p. 226, and Fig. 95). Study its dorsal surface, the. 

 papillae, etc. Then dissect its muscles (p. 228) from the ventral side. 

 The stylohyoid, digastric, and mylohyoid muscles must be removed. 

 Then dissect (a) the styloglossus (Fig. 96, e), (6) the genioglossus 

 (Fig. 96, _/"), (c) the hyoglossus (Fig. 96, h). Make a transverse 

 section of the tongue to see the intrinsic muscle-fibres. 



III. The thyroid gland (p. 254, and Fig. 96, e). Clean the 

 sternomastoid muscles. Cut their interdigitating portions along the 

 median line and reflect them. Find the lateral lobe of the thyroid 

 gland beneath the lateral borders of the sternohyoid muscles. 

 Dissect it, being careful not to destroy the delicate isthmus. 



