OIAs Muscles of facial expression (1)

Question 1

Epicranius- covers upper part of cranium and consists of 2 muscular parts, united by
tendinous sheath called the epicranial aponeurosis..

Answer 1

i. Frontalis – lies over frontal bone
ii. Occipitalis – lies over occipital bone
iii. Contraction raises eyebrows & wrinkles forehead

Question 2

Orbicularis Oculi

Answer 2

i. Surrounds eye
ii. Causes eye to close or blink, “winking muscle”
iii. Compresses the lacrimal gland

Question 3

Orbicularis Oris

Answer 3

i. Surrounds mouth
ii. Closes and protrudes lips, “kissing muscle”

Question 4

Buccinator

Answer 4

i. In wall of the cheek
ii. Compresses cheek inward (assists with chewing, whistling)

Question 5

Zygomaticus ( major and minor)

Answer 5

i. Extends from zygomatic arch down to corner of mouth
ii. Major raises corner of mouth, “smiling muscle”; minor raises upper lip to expose
teeth

Question 6

Platysma

Answer 6

i. From the chest upward over neck to mandible
ii. Pulls angle of mouth downward, “Frowning muscle”, tenses neck skin
iii. Also lowers mandible