Muscles

Question 1

Anconeus

Answer 1

Actions: elbow extension
Nerve: Radial
Spinal Segment: C7, C8 (T1)

Question 2

Biceps (when strong contraction required)

Answer 2

Action: Shoulder Flexion
Nerve: Musculocutaneous
Spinal Segment: C5, C6, C7 (lateral cord)

Question 3

Biceps Brachii

Answer 3

Actions: Elbow flexion, supination
Nerve: Musculocutaneous
Spinal Segment: C5, C6

Question 4

Brachialis

Answer 4

Action: Elbow flexion
Nerve: Musculocutaneous
Spinal Segment: C5, C6, (C7)

Question 5

Brachioradialis

Answer 5

Action: Elbow flexion
Nerve: Radial
Spinal Segment: C5, C6, (C7)

Question 6

Coracobrachialis

Answer 6

Action: Shoulder flexion
Nerve: Musculocutaneous
Spinal Segment: C5, C6, C7 (lateral cord)

Question 7

Deltoid

Answer 7

Ax: Abduction
N: Axillary
Spinal Segment: C5, C6 (posterior cord)

Question 8

Anterior Deltoid

Answer 8

AX: Shoulder flexion, horizontal adduction, internal rotation
N: Axillary
Spinal Segment: C5, C6 (posterior cord)

Question 9

Posterior Deltoid

Answer 9

AX: extension, horizontal abduction, external rotation
N: axillary
Spinal Segment: C5, C6 (posterior cord)

Question 10

Flexor carpi radialis

Answer 10

AX: pronation, wrist flexion, radial deviation
N: Median
Spinal Segment: C6, C7

Question 11

Flexor carpi ulnaris

Answer 11

AX: elbow flexion, wrist flexion, ulnar deviation
N: Ulnar
Spinal Segment: C7, C8

Question 12

Infraspinatus

Answer 12

AX: Horizontal abduction, abduction, external rotation
N: Suprascapular
Spinal Segment: C5, C6 (brachial plexus trunk)

Question 13

Latissimus dorsi

Answer 13

ax: extension, adduction, internal rotation, scapular depression and protraction
N: thoracodorsal
SS: C6, C7, C8 (posterior cord)

Question 14

Levator scapulae

Answer 14

AX: elevation of scapula, scapular downward rotation
N: Dorsal scapular (C3, C4 nerve roots)
SS: C3, C4

Question 15

Long head of biceps (if arm externally rotated first)

Answer 15

AX: Abduction
N: Musculocutaneous
SS: C5, C6, C7 (lateral Cord)

Question 16

Pectoralis major

Answer 16

Ax: Horizontal adduction, adduction, internal rotation, scapular depression and protraction
N: Lateral pectoral
SS: C5, C6 (lateral cord)

Question 17

Pectoralis major clavicular fibers

Answer 17

AX: forward flexion
N: lateral pectoral
SS: C5, C6 (lateral cord)

Question 18

Pectoralis major sternocostal fibers

Answer 18

AX: extension
N: Lateral & Medial pectoral
SS: C5, C6 (lateral cord), C8, T1 (medial cord)

Question 19

Pectoralis minor

Answer 19

AX: scapular depression, protraction, downward rotation
N: medial pectoral
SS: C8, T1 (medial cord)