Muscles of the Head

Occipitofrontalis M.

Action

• elevation of eyebrows

• creases skin in forehead

• moves scalp backward and forward

Occipitofrontalis M.

Origin:

F: skin of eyebrow and forehead ( blends with orbicularis oculi muscle)

O: occipital bone (superior nuchal line)

Orbicularis Oculi M.

Action:

• closes eyelids (blink/wink)

Orbicularis Oris M.

Action

• closes and puckers lips

Zygomaticus Major M.

Action: elevation of the corner of the mouth

Origin: Zygomatic bone

Buccinator M.

Action

• compression of cheek (e.g. inflating a balloon, playing a wind musical instrument)

Masseter M.

Action

• elevation of mandible (closing mouth)

• protraction of mandible

Temporalis M.

Action

• elevate mandible

• retraction of mandible

Origin

• temporal fassa

Levator LabII Superioris M.

Action

• elevation of upper lip

Depressor LabII Inferioris M.

Action

• depression of lower lip (pout)

Mentalis M.

Action

• wrinkles of chin

• raises and protrudes lower lip

Platysma M.

Action

• elevates and creases skin of neck

• depression of lower lip/ angle of mouth

Mylohyoid M.

Action

• elevation of floor of mouth

Insertion

• hyoid bone

• midline fibrous raphe

Sternohoid M.

Action

• depression of hyoid bone

Origin

• Sternum

• Clavicle

Insertion

• hyoid bone

Omohyoid M.

Action

• depression of hyoid bone

Insertion

• hyoid bone

Thyrohyoid M.

Action

• elevation of larynx

• depression of hyoid bone

Origin

• thyroid cartilage of larynx

Insertion

• hyoid bone

Sternothyroid M

Action

• depression of larynx

Origin

• Sternum

Insertion

• Thyroid cartilage of larynx

Sternocleidomastoid M.

Action:

• unilateral rotation of head so face turns to opposite side

• bilateral flexion of neck

• bilateral extension of head

Origin

• clavicle

• sternum

Insertion

• mastoid process

• lateral one-half of superior nuchal line of occipital bone

Scalene M.

Action

• anterior: elevation of rib 1; lateral flexion/ rotation of neck

• middle: elevation of rib 1; lateral flexion of neck

• posterior: elevation of rib 2; lateral flexion of neck