Muscles of the Pig

Muscles of Head

The facial panniculus is pale, thin, and difficult to separate from the skin.

The orbicularis oris is little developed.

The levator nasolabialis is thin and pale, and is undivided.

The levator labii superioris proprius may well be termed the levator rostri. It has a large penniform belly, which arises in the fossa on the lacrimal bone and maxilla. The tendon ends on the anterior part of the os rostri. A muscular slip connects it with the premaxilla.

The zygomaticus arises on the fascia over the masseter and ends at the angle of the mouth.

The depressor labii inferioris separates from the buccinator only near the angle of the mouth; it ends by a number of tendinous branches in the lower lip.

The dilatator naris lateralis is well developed. It arises under the levator rostri and ends by a tendinous network around the nostril.

The dilatator naris transversus is represented only by a few fibers which cross over the os rostri.

The depressor rostri arises on the facial crest. It has a long strong tendon which passes below the nostril and turns up and inward to meet the tendon of the opposite side and end in the skin of the snout. It depresses the snout and contracts the nostril.

The malaris is absent, and the other palpebral muscles present no special features.