. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SKELETAL MUSCULATURE OP THE KING SALMON. 37 The cephalic portion of the muscle in the medium sized fish is about 4 cm. broad in the anterior posterior extent and about cm. in the dorso-ventral dimension. The thick- ness is from i to cm. (6) Mandibular portion of the adductor.—Besides the cephalic portion of the adductor there is a stout mandibular portion. It arises from the anterior border of the tendon over the quadrate bone and the angle of the mouth. It extends anteriorly to
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SKELETAL MUSCULATURE OP THE KING SALMON. 37 The cephalic portion of the muscle in the medium sized fish is about 4 cm. broad in the anterior posterior extent and about cm. in the dorso-ventral dimension. The thick- ness is from i to cm. (6) Mandibular portion of the adductor.—Besides the cephalic portion of the adductor there is a stout mandibular portion. It arises from the anterior border of the tendon over the quadrate bone and the angle of the mouth. It extends anteriorly to an attach- ment along the inner surface of the middle third of the dentary, i. e., from a point directly below the angle of the mouth forward to a point on the jaw. At the origin of this portion the fibers are continuous with the fibers of the cephalic portion. From the origin the fibers diverge slightly as they are distributed to their attachments on the dentary. The lower margin of the muscle takes a continuous attachment along the under and inner surface of the bone. The upper and outer side of the muscle remains free from attachments. The contraction of the adductor closes the mouth with great power. In addi- tion to its function in feeding it undoubtedly takes part in the motions of respiration. LEVATOR ARCUS PALATINI. This is a short, thick, comparatively wide muscle which takes its origin from the angle formed in the external surface of the sphenotic, filling the space just posterior to the eyeball. The fibers run ob- liquely downward and backward to a broad insertion on the anterior surface of the superior half of the hyomandibular and also into the superior margin of the metaptery- goid. The muscle at its posterior dorsal margin is intimately associated with and often inseparable from the fibers at the origin of the dilatator operculi muscle. DILATATOR Fig. 3.—Superficial head muscles after removal of the skin and a part of the jaws. >l. C, adductor m
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