Muscles of the Head and Face

Characteristics of face and neck muscles

not attached to a moving limb

attached to either skull bones or skin

can show changes in emotion

number of facial muscles

60

Orbicularis oculi

surrounds the eye

Orbicularis oris

surrounds the mouth

Nasalis

runs across the bridge of the nose

Mentalis

muscle on the chin

Buccinator

runs horizontally across the cheek

Zygomaticus

2 muscle strands running from zygomatic bone to the orbicularis oris

Platysma

runs from bottom of throat to the bottom of mandible

Masseter

vertically over the buccinators from the zygomatic arch and attaches to the mandible

Temporalis

begins at upper edge of temporal bone and attaches to the mandible

Frontalis

raises eyebrows

Occipitalis

synergist when raising eyebrows

Epicranius

Occipitalis and Frontalis

Occipitalis and Frontalis connection

epicranial aponeurosis

muscles needed to frown: muscles to smile

40:20

job of Orbicularis oculi

closes the eye or squinting

Job of Orbicularis oris

close and/or protrudes lips

job of Nasalis

Crinkles nose, opens and closes nostrils

job of mentalis

Protrudes lower lip

job of buccinator

sucks in the cheek

job of Zygomaticus

smiling

job of Platysma

frowning

job of temporalis and masseter

closing jaw