Essentials of Anatomy and Physiology

154

Levator labii
superioris
Zygomaticus

Orbicularis oris

Mentalis

Platysma

Anterior—left lateral view

Orbicularis oculi

Temporalis

Buccinator

Masseter

Sternohyoid

Sternocleidomastoid

Trapezius

Frontalis

Epicranial

aponeurosis

Figure 7–9. Muscles of the

head and neck in anterior, left-lat-

eral view.

QUESTION:In what way are both

orbicularis muscles similar?

Table 7–3 MUSCLES OF THE HEAD AND NECK

Muscle Function Origin Insertion

Frontalis

Orbicularis oculi

Orbicularis oris

Masseter

Buccinator

Sternocleidomastoid

Semispinalis capitis

(a deep muscle)

Splenius capitis

Raises eyebrows, wrinkles skin

of forehead

Closes eye

Puckers lips

Closes jaw

Pulls corners of mouth laterally

Turns head to opposite side

(both—flex head and neck)

Turns head to same side (both—

extend head and neck)

Turns head to same side (both—

extend head)

• epicranial aponeurosis


• medial side of orbit


• encircles mouth


• maxilla and zygomatic


• maxilla and mandible


• sternum and clavicle


• 7th cervical and first 6
  thoracic vertebrae


• 7th cervical and first 4
  thoracic vertebrae
  
  
  • skin above supraorbital
    margin
  
  
  • encircles eye
  
  
  • skin at corners of mouth
  
  
  • mandible
  
  
  • orbicularis oris
  
  
  • temporal bone (mastoid
    process)
  
  
  • occipital bone
  
  
  • occipital bone