Muscle Actions of the Upper Limb

Question 1

Trapezius m.

Answer 1

upper fibers elevate, middle fibers pull it medially, lower fibers pull medial border downward.

Question 2

Latissimus dorsi m.

Answer 2

extends, adducts, and medially rotates the arm.

Question 3

Levator scapulae m.

Answer 3

raises medial border of the scapula aka elevates the scapula.

Question 4

Rhomboid Major m.

Answer 4

raises medial border of the scapula upward and medially.

Question 5

Rhomboid Minor m.

Answer 5

raises medial border of scapula upward and medially.

Question 6

Pectoralis major m.

Answer 6

adducts arm and rotates it medially.

Question 7

Pectoralis minor m.

Answer 7

depresses the shoulder or elevates the ribs if the scapula is fixed.

Question 8

Subclavius m.

Answer 8

depresses the clavicle and stabilizes it.

Question 9

Serratus anterior m.

Answer 9

draws the scapula forward.

Question 10

Deltoid m.

Answer 10

abducts the arm.

Question 11

Supraspinatus m.

Answer 11

abducts the arm.

Question 12

Infraspinatus m.

Answer 12

laterally rotates the arm.

Question 13

Teres major m.

Answer 13

medially rotates and adducts the arm.

Question 14

Teres minor m.

Answer 14

laterally rotates the arm.

Question 15

Subscapularis m.

Answer 15

medially rotates the arm.

Question 16

Biceps brachii m.

Answer 16

supinator of the forearm, a flexor of the elbow, and weak flexor of the shoulder.

Question 17

Coracobrachialis m.

Answer 17

flexes arm and is a weak adductor of the arm.

Question 18

Brachialis m.

Answer 18

flexor of the elbow.

Question 19

Triceps brachii m.

Answer 19

extensor of elbow joint.