Craniofacial Muscles (identify, function, innerv)

Question 1

Buccinator

Answer 1

[L. bucca, cheek]

attachments- from alveolar processes of the maxilla & mandible, pterygoid hamulus & pterygomandibular raphe to angle of mouth

function- compresses cheek (when blowing)

innervation- buccal branch of the facial n.

Question 2

Depressor anguli oris

Answer 2

attachments- from mandible to angle of mouth

function- depresses angle of mouth laterally (frown, sadness)

innervation- buccal & mandibular branch of the facial n.

Question 3

Depressor labii inferioris

Answer 3

attachments- from oblique line of mandible to skin of lower lip

function- depresses lower lip (pouting, sadness)

innervation- mandibular branch of the facial n.

Question 4

Frontalis

Answer 4

attachments- from the superficial fascia of the eyebrows to the epicranial aponeurosis

function- protracts the scalp or elevates eyebrows & nose (surprise or curiosity)

innervation- temporal branch of the facial n.

Question 5

Levator labii superioris

Answer 5

attachments- from the inferior orbital margin to the lateral aspect of the upper lip

function- raises & everts upper lip (showing sadness)

innervation- buccal & zygomatic branches of the facial n.

Question 6

Nasalis

Answer 6

attachments- from the maxilla lateral & inferior to the nasal notch to the bridge & ala of the nose

function- transverse fibers compress & alar fibers widen the nasal aperture (flaring nostrils during anger or exertion)

innervation- buccal branch of facial n.

Question 7

Orbicularis oculi

Answer 7

attachments- from orbital margin & medial palpebral lig. to superficial fascia of the eyelid

function- a palpebral sphincter (closes eyes, winking)

innervation- temporal & zygomatic branches of the facial n.

Question 8

Orbicularis oris

Answer 8

attachments- from angle of mouth to the superficial fascia of the upper lip

function- an oral sphincter (closes mouth, kissing)

innervation- buccal & mandibular branches of the facial n.

Question 9

Platysma

Answer 9

(G. platys, flat, broad)

attachments- from the lower border of the mandible to the superficial fascia of the skin of the neck overlying the clavicle

function- wrinkles the anterior nuchal skin (conveying tension or stress)

innervation- cervical branch of the facial n.

Question 10

Zygomaticus major

Answer 10

[G. zygon, yoke, a joining or pair]

attachments- from zygomatic bone to angle of mouth

function- raises angle of mouth (smiling, happiness)

innervation- buccal & zygomatic branches of the facial n.