7. The digastric ([p. 107], and [Fig. 65], b). Transect, and reflect completely, to the origin and insertion.
8. The mylohyoid ([p. 114], and [Fig. 65], c). Transect and reflect.
9. The geniohyoid ([p. 113], and [Fig. 67], g).
10. The jugulohyoid ([p. 113], and [Fig. 67], b).
(The extrinsic muscles of the tongue ([p. 228], and [Figs. 67] and [96]) may be dissected at this point, if desired. (a) The styloglossus; (b) the genioglossus; (c) the hyoglossus. They need not be cut.)
11. The masseter ([p. 108], and [Fig. 65], a). Cut the superficial and middle layers near their insertions by incisions parallel to the border of the jaw. Cut the deep layer near its origin. Look for the origin of fibres of the temporal muscle from the inner surface of the middle layer.
12. The temporal ([p. 110], and [Fig. 63], n). Clear its outer surface completely. Cut the temporal fascia transversely and reflect it toward the insertion of the muscle, with the superficial portion of the muscle. Cut through the zygomatic arch at its two ends and remove it, dissecting the fibres of the temporal free from their origin on its inner surface. Then examine the insertion of the temporal.
(The muscles of the pharynx ([p. 232]) may be dissected at this point; for directions, see [page 451].)
13. The ceratohyoid ([p. 115]). To uncover this, the middle constrictor of the pharynx ([Fig. 67], j) must be cut and reflected.
Cut the mylohyoid, geniohyoid, genioglossus, and the mucosa of the floor of the mouth free from the mandible on both sides, so that the tongue and the floor of the mouth may be drawn ventrad and turned out of the way, exposing the roof of the mouth (as in [Fig. 66], [p. 112]). Cut through one side of the pharynx near the ventral surface and turn the tongue toward the uncut side.