. Dissection of the dog as a basis for the study of physiology . ast premolar of themaxilla. Insert a probe into the duct and demon-strate the opening into the mouth. c. The Sub-maxillary Gland forms on each sidea compact mass lying just posterior to the angle ofthe mandible and concealed by connective tissue,which must be cleared away. d. Whartons Duct. The duct of the sub-maxil-liary will be exposed best if the attachment of thedigastric (see peige 65) to the mandible is cut, andthis muscle reflected backward as far as possible. Ifthe thin sheet of muscle (mylo-hyoid) lying in thefloor of th
. Dissection of the dog as a basis for the study of physiology . ast premolar of themaxilla. Insert a probe into the duct and demon-strate the opening into the mouth. c. The Sub-maxillary Gland forms on each sidea compact mass lying just posterior to the angle ofthe mandible and concealed by connective tissue,which must be cleared away. d. Whartons Duct. The duct of the sub-maxil-liary will be exposed best if the attachment of thedigastric (see peige 65) to the mandible is cut, andthis muscle reflected backward as far as possible. Ifthe thin sheet of muscle (mylo-hyoid) lying in thefloor of the mouth is now carefully cut the duct will beexposed, and can be traced back to the gland and for-ward to its opening upon the floor of the mouth. PHARYNX AND LARYNX. 47 e. The Chorda Tympaxi, the nerve of the sub-maxillary, is also shown in this dissection. Comingout from underneath the mandible and passing to-ward the ventral mid-line w411 be seen the largelingual nerve. Just at the point it comes into viewit gives off a minute branch, the chorda, which runs. Fig. 3.—Diagram of the Sub-Maxillary Gland. to the duct and thence to the gland. The relations ofthese parts is shown in Fig. 3. f. The Sub-lingual Gland lies along the outerside of the duct of Wharton, and is crossed by thelingual nerve. It is a small narrow glandular bodywhich opens upon the floor of the mouth by severalsmall ducts. 6. The Larynx. Remove the larynx and the hyoidbone with its processes from the body for more care-ful examination. The larynx consists of four princi-pal cartilages, a. The thyroid, the largest and mostanterior; the sides or wings are w^idely open behind„b. The cricoid, having somewhat the shape of a seal-ring, being narrow on the ventral surface and ex-panded dorsally. It is connected to the thyroid byligaments and muscles, c. The ^rj/<^;^^/(^ cartilages are 48 THE THORACIC VISCERA, BUCCAL CAVITY, ETC two small triangular cartilages attached to the anteriorend of the dorsal side of
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