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Platysma (subcutaneous neck muscle); pulls the lower jawbone down slightly
and pulls down the lower lip until the teeth are bared.
Also prevents the superficial necks veins from being crushed.
Quadratus labii inferioris: pulls the down and everts the lower lip.
The protuberance of the lip is also aided by the action of the incisive muscle,
located below the quadratus.
Zygomatic of the upper lip: pulls the down of the joint of the lips upwards and
outwards, as in a smile.
Quadratus labii superioris: lifts the upper lip and part of the ala of the nose.
Caninus: below the quadratus, raises the skin at the angles of the mouth.
Buccinator: muscular foundation of the cheek.
Pulls the joint of the lips inwards and during chewing compresses
cheeks and lips against the dental arch.
Orbicularis oris: closes the mouth, tightens the line formed by the junction of
the lips and wrinkles the lips.
Mentalis: raises and wrinkles the chin, raises the lower lip and curves it
downwards.
Orbicularis oculi: closes the eyelids.
Frontalis: raises the eyebrows and opens the eyes wide.
Masseter: a skeletal muscle which raises the lower jawbone as when
chewing.
Sternocleidomastoid: another skeletal muscle which flexes the head,
tilting it to the side it is on and turning the face to the opposite side.
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