UNIT 3- Superficial and Deep Muscles of the Neck, Shoulder, Thorax, and Abdomen

Question 1

Platysma

Answer 1

Depresses mandible, pulls lower lip back and down (pouting)

Question 2

Sternocleidomastoid

Answer 2

Simultaneous contraction of both muscle heads, flexes neck, Individual action of each muscle head; rotates head to shoulder on opposite side

Question 3

Trapezius

Answer 3

Extends neck; retracts scapula

Question 4

Deltoid

Answer 4

Flexes, extends, abducts; medially and laterally rotates arm

Question 5

Pectoralis major

Answer 5

primary muscle of arm flexion; adducts and medially rotates arm; wit arm fixed, pulls chest forward (as in forced inspiration)

Question 6

Pectoralis minor

Answer 6

depresses and protracts scapula, elevates ribs

Question 7

serratus anterior

Answer 7

abducts and stabilizes scapula

Question 8

external oblique

Answer 8

compresses anterior abdominal

Question 9

internal oblique

Answer 9

compresses anterior abdominal wall; flexes trunk, rotates trunk; depresses lower ribs

Question 10

transverse abdominis

Answer 10

compresses anterior abdominal contents

Question 11

rectus abdominis

Answer 11

compresses anterior abdominal wall; flexes trunk