Page 158 - Anatomy and Physiology of Farm Animals, 8th Edition

Anatomy of the Muscular System / 143

condition, with the addition of a small
deep part of the muscle that features a
VetBooks.ir separate tendon inserting on the fifth digit.

Flexors of the Digit. The superficial and
deep digital flexor mm. are arranged in the
pelvic limb similarly to the thoracic limb.
However, the tendon of the superficial digital
flexor muscle also attaches to the calcaneus.
b

a Muscles of the Head

Muscles of Mastication

Muscles of mastication are those that have
attachments to the mandible and whose
contractions produce the jaw movements
Figure 7-11. Muscles on the cranial aspect of associated with chewing (Fig. 7‐12). As a
the pelvic limb that extend to the phalanges general rule, considerably more muscle mass
flex the hock, but extend the digit; whereas those (and therefore strength) is devoted to the
on the caudal aspect extend the hock while flexing elevation (closure) of the mandible than to
the digit. Two examples are depicted: a, long depression (opening). Almost all of the
digital extensor m.; b, deep digital flexor m. muscles of mastication are innervated by

M. Caudal auricular Rostral auricular muscles

M. Parotidoauricularis M. Levator anguli oculi medialis
M. Orbicularis oculi
Facial nerve M. Levator nasolabialis
M. Brachiocephalicus
M. Zygomaticus
M. Splenius
Gland M. Buccinator

M. Caninus

Parotid

M. Sternomandibularis
M. Masseter
M. Mentalis
M. Omohyoideus/Sternohyoideus M. Orbicularis oris
Figure 7-12. Superficial muscles (m.) of the equine head.