10 Muscle Function

Question 1

Trapezius

Answer 1

Raises or lowers the shoulders and shrugs them

ALSO

Extends the head and neck when the occipital acts as the insertion

Question 2

Latissimus Dorsi

Answer 2

Extends the arm / adducts the arm posteriorly

Question 3

Biceps Brachii

Answer 3

Flexes the supinated forearm / supinates the forearm and hand

Question 4

Triceps brachii

Answer 4

Extends the lower arm

Question 5

Deltoid

Answer 5

Abduct the arm / assists in flexion and extension of the arm

Question 6

Sternocleidomastoid

Answer 6

Flexes the head and neck (prayer muscle); one muscle alone rotates head toward opposite side; spasm of this muscle alone or associated with trapezius call toricollis, or wryneck

Question 7

Rhomboid Major

Answer 7

Retracts, rotates, and fixes the scapula

Question 8

Rhomboid Minor

Answer 8

Retracts, rotates, elevates and fixes the scapula

Question 9

Teres Major

Answer 9

Assists in extension, adduction, and medial rotation of the arm

Question 10

Teres Minor

Answer 10

Rotates the arm outward