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MUSCLES OF THE HEAD | Up
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CHEEKS |
Figure 3-16.—Muscle anatomy of mastication.
Muscle
Orbicularis oris
Table 3-3.—Muscles of Facial Expression
Origin
Insertion
Encircles the mouth (no
Corners of the mouth
attachement to bone)
Description
Located between the skin and
mucous membranes of the
lips. Makes lips close and
pucker.
Buccinator
Alveolar process of
maxilla and mandible
Orbicularis oris at the corner
Located in the walls of the
of the mouth
cheeks, holds food in contact
with teeth when chewing, and
assists in blowing air out of
the mouth.
Mentalis
Mandible
Skin of chin
Raises and wrinkles the skin
of the chin and decreases and
protrudes the lower lip.
Zygomaticus Major
Zygomatic bone
Orbicularis oris (angle of the
Raises the corner of the
mouth)
mouth when smiling.
3-9
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