Muscles of Facial Expression

Question 1

Orbicularis Oculi

Answer 1

Action: Eye Closure. Innervation: Facial Nerve (CNVII)

Question 2

Orbicularis Oris

Answer 2

Action: Mouth closure: Closes lips, protudes lips forward, presses lips against teeth. Innervation: Facial nerve (CNVII)

Question 3

Zygomaticus Major/Minor

Answer 3

Action: Pull corners of lips upward. Innervation: Facial Nerve (CNVII)

Question 4

Risorius

Answer 4

Action: Pulls the corners of the mouth posterity (grin or grimace) Innervation: Facial nerve (CNVII)

Question 5

Frontalis (Occipitofrontailis)

Answer 5

Action: Raise eyebrows. Innervation: Facial Nerve (CNVII)

Question 6

Buccinator

Answer 6

Action: Compress cheeks. Innervation: Facial Nerve (CNVII)

Question 7

Masseter

Answer 7

Action: Jaw Closure. Innervation: Trigeminal Nerve (CN V, Mandibular branch)

Question 8

Temporalis

Answer 8

Action: Elevates mandible, closes jaw. Innervation: Trigeminal Nerve (CN V, Mandibular branch)