• Origin: Horse: Lower edge of the upper jaw between the canine tooth and the molars, continuing along the tooth sockets of the molars; upper edge of the lower jaw between the canine tooth and the molars and an area to the rear of the last molar. Ox: Edges of the tooth sockets of the upper and lower jaws. Dog: Cheek portion: edges of the tooth sockets of the molars of the upper and lower jaws; lip portion: corner of the mouth.
• Insertion: Comer of the mouth, merging with fibers of the orbicularis oris. Dog: Also into the upper and lower lips (lip portion).
• Action: Flattens (compresses) the cheek, pushing food against the molars for chewing. Also pulls the corner of the mouth rearward.
• Structure: In the horse, the buccinator consists of deep and superficial portions. A tendinous band running the length of the superficial portion creates a furrow that separates the belly into upper and lower bulging forms, lying between the corner of the mouth and the masseter muscle. In the ox, the buccinator is divided into a superficial portion with vertical fibers, and a deep portion, the fibers of which are directed forward; it can be seen as a bulging form on the surface. In the dog, the buccinator consists of a cheek portion that is divisible into upper and lower parts that fuse together at the corner of the mouth, and a lip portion that passes forward from the corner of the mouth and passes deep to the orbicularis oris.
DEPRESSOR LABII MAXILLARIS
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