In the anatomy of the
are only two prominent, or great, head muscles, and these are the
Temporalis. The two are
The Masseter is a great powerful, and very thick muscle covered by a
tough, shining fascia lying ventral to the zygomatic arch, which is its origin.
It inserts into the posterior half of the lateral surface of the mandible. Its action is the elevation of the mandible (closing of the jaw).
The temporalis is a great mass of mandibular muscle, and is also
covered by a tough and shiny fascia. It lies dorsal to the zygomatic arch and
fills the temporal fossa of the skull. It arises
from the side of the skull and inserts into the coronoid process of the
mandible. It too, elevates the jaw.