If the superficial muscles of the head have been dissected according to
the directions above given (p. 434), the skin of the head and neck, and
the external ear, will have been removed, and the specimen is ready for
further study. The parotid and submaxillary glands (Fig. 65, 1 and 2)
should be removed if this has not been done; also the lymphatic glands
(Fig. 65, 3).
If the superficial muscles of the head have not been dissected and are
not to be, remove the skin from the side of the neck, head, and face to
the median dorsal line, removing the thin superficial muscles with the
skin. Remove also the parotid, submaxillary, and lymphatic glands (Fig.
65, 1, 2, and 3), and cut through the ear-muscles and the cartilaginous
auditory meatus (under direction) and remove the external ear. Clean
fat, connective tissue, etc., from the surface of the muscles of the
thorax, neck, and head; then dissect as follows:
1. The sternomastoid (p. 139, and Fig. 65, _g_). Transect and reflect
it.
2. The cleidomastoid (p. 120, and Fig. 65, _h_). This has already been
transected; examine now its origin.
Remove the large lymphatic gland beneath the sternomastoid and close to
the tympanic bulla, and clean the surface of the muscles in this region.
3. The levator scapulæ ventralis (p. 120, and Fig. 72, _c_, _c′_,
_c″_). This has already been cut; study now its origin.
4. The sternohyoid (p. 140, and Fig. 65, _e_). In raising it begin at
the cranial end and take care not to injure the subjacent sternothyroid
(Fig. 65, _g′_). Transect.