Muscles of the Head and Neck Control
Facial Expressions, Allow You to Speak
and Chew, and enable Your eyes to
Open, Close, and Move
Muscles of the head and neck produce facial expres-
sions that give humans the ability to express a wide va-
riety of emotions, such as happiness, displeasure, fear,
and surprise. Muscles that move the mandible (lower
jaw) are involved in biting and chewing. Because of this,
they are also known as muscles of
mastication
(chewing).
These muscles also help in speech. The muscles that
control facial expression, speech, and chewing are il-
lustrated in
Figure 6.14
.
M uscles o f th e h ead and neck • Figure 6.1 4
Right lateral superficial view
Temporalis
Occipitofrontalis
(occipital belly)
Mandible
Masseter
Occipitofrontalis
(frontal belly)
Orbicularis
oculi
Zygomaticus major
Buccinator
Orbicularis oris
Platysma
Muscle
Origin
Insertion
Action
Muscles of the head and neck that produce facial expressions
Occipitofrontalis
(ok-sip-i-to-frun-TA-lis) —divided into frontal belly and occipital belly
Frontal belly
Epicranial aponeurosis
Skin superior to orbit
(flat tendon attaching
frontalis and occipitalis)
Occipital belly
Occipital and temporal
Epicranial aponeurosis
Draws scalp forward, as in frowning; raises
eyebrows; and wrinkles skin of forehead
horizontally, as in a look of surprise
Draws scalp backward
Orbicularis oris
(or-bi'-ku-LAR-is OR-is)
Muscle fibers
surrounding the
opening of the mouth
Skin at the corner of the mouth
Closes and protrudes lips, as in kissing;
compresses lips against teeth; and shapes
lips during speech
Zygomaticus major
(zf-go-MA-ti-kus)
Zygomatic bone
Skin at the angle of the mouth
and orbicularis oris
Draws angle of mouth upward and outward,
as in smiling or laughing
Buccinator
(BUK-si-na'-tor)
Maxilla and mandible
Orbicularis oris
Presses cheeks against teeth and lips, as
in whistling, blowing, and sucking; draws
corner of mouth laterally; assists in chewing
by keeping food between teeth
Platysma
(pla-TIZ-ma)
Fascia over deltoid and
pectoralis major
Mandible, muscles around angle
of mouth, skin of lower face
Draws outer part of lower lip downward and
backward, as in pouting; depresses mandible
Orbicularis oculi
(OK-u-IT)
Medial wall of orbit
Circular path around orbit
Closes eye
Muscles of the head and neck that control speech and chewing
Masseter
(MA-se-ter)
Maxilla and zygomatic
arch
Mandible
Elevates mandible, as in closing mouth
Temporalis
(tem'-por-A-lis)
Temporal bone
Mandible
Elevates and retracts mandible
Skeletal Muscles Are Grouped Based on Location and Action 173
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