Lecture 26 - Muscles Of The Face

Question 1

What is the origin/insertion/main action of the temporalis?

Answer 1

• O: Temporal lines of the parietal bone
• I: Coronoid process of the mandible
• MA: Elevation & retraction of mandible

Question 2

What is the origin/insertion/main action of the masseter?

Answer 2

• O: Zygomatic arch & maxilla
• I: Ramus of mandible
• MA: Elevation & retraction of mandible

Question 3

What is the origin/insertion/innervation/main action of the sternocleidomastoid?

Answer 3

• O: Medial, superior clavicle & manubrium
• I: Mastoid process of temporal bone
• Inn: CN XI (accessory nerve)
• MA: Bilateral: neck flexion, Unilateral: neck rotation & chin tilt upwards to the opposite side

Question 4

What is the origin/insertion/main action of the anterior scalene?

Answer 4

• O: Transverse processes C3-C6
• I: Rib 1
• MA: Neck flexion

Question 5

What is the origin/insertion/main action of the middle scalene?

Answer 5

• O:Transverse processes of C5-C7
• I: Rib 1
• MA: Neck lateral flexion, elevates rib 1 during forced inspiration

Question 6

What is the origin/insertion/main action of the posterior scalene?

Answer 6

• O: Transverse processes of C5-C7
• I: Rib 2
• MA: Neck lateral flexion, elevates rib 2 during forced inspiration