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Oral Anatomy

 January 2, 2014 |  admin |  Oral Anatomy, Oral histology, Undergraduate, Viva
Masseter is covered by
Platysma; Risorius; Parotid
gland
Principal postioner of
mandible during elevation is the
Temporalis
The fan shaped muscles of
mastication is the
Temporalis
The antagonist muscle to
masseter while retruding jaw is the
Posterior temporalis. The
anterior pterygoid is synergistic with masseter while clenching.
The facial muscle(s) active
during opening of jaw is(are)
Digastric group of muscles;
Mylohyoid and geniohyoid; Lateral pterygoid
When the jaw is opened
against resistance the
Temporalis remains silent
The antagonist muscle of
elevator muscles is the
Digastric group of muscles;
Mylohyoid and geniohyoid; Suprahyoid muscles
With mandible is retruded
with mouth closed, the muscle involved are
Posterior fibers of
temporalis; Suprahyoid fibers; Infrahyoid fibers
The duration of each
chewing cycle is between
0.6 – 1 second
The chewing forces reaches
a maximum with
Centric occlusion