The =masseter= is large. It arises from the zygomatic arch, and extends
beyond the branch of the jaw below and behind. Three strata may be
recognized in its structure.
The =temporalis= is very large and strong, and contains much tendinous
tissue. It arises from the temporal fossa and the orbital ligament.
The =digastricus= is usually not digastric, but is a strong, round,
fleshy muscle, which arises on the paramastoid or styloid process and is
inserted into the border and inner surface of the ramus at the level of
the last molar teeth.
The stylo-mandibularis is absent.