Anatomy of the Cat

by Jacob Reighard; H. S. Jennings

3. Dissect the sympathetic ([p. 404]), following it and its branches to the pelvic region ([Figs. 156], [157], and [164]).

4. The hypoglossal ([p. 383], and [Fig. 156], b).

5. The glossopharyngeal ([p. 378], and [Fig. 156], a).

6. The accessory nerve ([p. 382], and [Fig. 156], c; [Fig. 158], 1).

Cut away a portion of the tympanic bulla and the base of the skull, sufficient to follow these nerves in the jugular foramen, to the brain.

7. Locate the stylomastoid foramen and pick away overlying tissue until the facial nerve is found emerging and then follow its branches to their distribution ([p. 375], and [Fig. 155]).

8. Expose the ventral surface of the pterygoid muscles just mediad of the angle of the jaw. Divide and reflect them, and the mandibular division of the fifth nerve ([p. 373], and [Fig. 154]) will be found dorsad of them and of the internal maxillary artery. The chorda tympani ([p. 375]) passes ventrad of the artery to join the lingual. Follow out (1) the lingual branch ([p. 375]) (with the chorda tympani), and (2) the inferior alveolar ([p. 375]) by cutting away the ventral border of the mandible. Then cut the mandible near the canine tooth, and pull it to one side, and follow out the muscular branches of the mandibular nerve.

9. Remove the mandible and find the maxillary nerve ([p. 371]) emerging from the foramen rotundum. Follow its branches and find the sphenopalatine ganglion ([p. 372]).

10. Remove the zygoma so as to expose the whole ventral aspect of the orbit. Carefully pick away the fat in the orbit without injuring any nerves, so as to expose the four recti muscles and the inferior oblique (see [p. 411], and [Fig. 166]). Find the abducens nerve ([p. 375], and [Fig. 154]), entering the dorsal edge of the lateral rectus, and follow it back. Look on the inner surface of the inferior rectus for the branch of the third nerve ([p. 369]) which supplies it. Find the branch of this nerve which runs to the inferior oblique muscle, and on it the ciliary ganglion; find the branches to the ciliary ganglion from the ophthalmic nerve and follow them ([p. 371]). Follow also the short ciliary nerves ([p. 370]) to the eyeball.

11. Trace the third nerve ([p. 369]) to its foramen of exit and find its branches. Where it passes between the superior and lateral recti, find the ophthalmic nerve ([p. 370]) by its side and trace its branches.