450 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, 6 and c) and lymphatic 
gland (Fig. 131, 12) covering the submaxillary gland (Fig. 131, 11) 
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 eencral 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 
papillz, 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), (4) the genioglossus 
(Fig. 96, /), (¢) the hyoglossus (Fig. 96, 4). Make a transverse 
section of the tongue to see the intrinsic muscle-fibres. 
III. The thyroid gland (p. 254, and Fig. 96, 6). 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. 
