Fundamentals of Anatomy and Physiology

The Muscular System 213

Temporalis

Masseter

Buccinator

Sternocleidomastoid

Trapezius

Deltoid

Frontalis

Orbicularis oculi

Nasalis

Zygomaticus major

Orbicularis oris

Depressor anguli oris

Platysma

Pectoralis major

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Figure 9-8B Some muscles of the head and neck (lateral view).
Table 9- 1 Muscles of Facial Expression
Muscle Function
Occipitalis^ Draws scalp backward^
Frontalis^ Elevates eyebrows, wrinkles skin of forehead^
Zygomaticus minor^ Draws upper lip upward and outward^
Levator labii superioris^ Elevates upper lip^
Levator labii superioris alaeque nasi^ Raises upper lip and dilates nostril^
Buccinator^ Compresses cheek and retracts angle^
Zygomaticus major Pulls angle of mouth upward and backward when
laughing
Mentalis^ Raises and protrudes lower lip as when in doubt^
Orbicularis oris^ Closes lips^
Risoris “Smiling” muscle
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Muscles Moving the Shoulder Girdle
The muscles that move the scapula are the levator scapulae
(leh-VAY-ter SKAP-you-lee), the rhomboids (ROM-boydz),
the pectoralis (peck-toh-RAL-is) minor, and the trapezius
(trah-PEE-zee-us). The trapezius is seen superficially be-
tween the neck and the clavicle. Refer to Figure 9-7 to view
superficial anatomy of the muscles of the trunk. The ser-
ratus (sir-AYE-tis) anterior muscle looks like the teeth of a