Muscle Actions, Nerve, Cord Segments

Question 1

Upper trapezius

Answer 1

A: Shoulder shrug + scapular upward rotation
N: Spinal accessory (XI) (C1-C4)

Question 2

Pectoralis major/minor

Answer 2

A: Shoulder horizontal adduction
N: Medial/Lateral pectoral (C5-T1)

Question 3

Pectoralis Minor

Answer 3

A: Scapular downward rotation + Horizontal Adduction + Depression

(DAD)

Question 4

Serratus Anterior

Answer 4

A: Protraction + scapular upward rotation
N: Long Thoracic C5-C7

Question 5

Levator scapula

Answer 5

A: Scapular Elevation + downward rotation
N: Dorsal Scapular (C5)

Question 6

Rhomboids

Answer 6

A: Retraction, Elevation, + Downward Rotation
N: Dorsal Scapular (C4-C5)

Question 7

Supraspinatus

Answer 7

A: Abduction (first 15 degrees)
N: Suprascapular (C4-C6)

Question 8

Infraspinatus

Answer 8

A: ER
N: Suprascapular (C4-C6)

Question 9

Latissimus Dorsi + Teres major

Answer 9

A: IR + Adduction
N: Thoracodorsal (C5-C8)

Question 10

Subscapularis

Answer 10

A: IR
N: Subscapular (C5-C8)

Question 11

Deltoid

Answer 11

A: Abduction, flexion, extension
N: Axillary (C5-C6)

Question 12

Teres minor

Answer 12

A: ER
N: Axillary

Question 13

Biceps Brachii

Answer 13

A: Elbow flexion, supination
N: Musculocutaneous (C5-C6)

Question 14

Coracobrachialis

Answer 14

A: Flexion + adduction
N: Musculocutaneous (C6-C7)

Question 15

Brachialis

Answer 15

Musculocutaneous (C5-C6)

Question 16

Flexor Digitorium (ulnaris part)

Answer 16

A:4-5th digit DIP flexion
N: Ulnar (C7-T1)

Question 17

FCU (flexor carpi ulnaris)

Answer 17

A:Wrist flexion (ulnar deviation)
N: Ulnar (C7-T1)

Question 18

Adductor pollicis

Answer 18

A: Thumb adduction
N: Ulnar (C8-T1)

Question 19

Abductor digiti

Answer 19

A: 5th digit abduction
N: Ulnar C8-T1

Question 20

Opponens digiti

Answer 20

A: 5th digit opposition
N: Ulnar C7-T1

Question 21

Flexor digiti

Answer 21

A:5th digit MCP flexion
N: Ulnar (C7-T1)

Question 22

Interossi

Answer 22

A: 2nd-5th digit MCP flexion, adduction, Abduction
N: Ulnar C8-T1

Question 23

Pronator teres/ Pronator quadratus

Answer 23

A: forearm pronation
N: Median C6-C7

Question 24

Flexor Carpi Radialis (FCR)

Answer 24

A: Wrist Radial Flexion
N: Median C6-C7

Question 25

Palmaris longus

Answer 25

A: Wrist Flexion
N: Median C7-T1

Not everyone has this muscle

Question 26

Flexor digitorium

Answer 26

A: 2nd-5th digit proximal IP flexion
N: Median C7-T1

Question 27

Flexor pollicis longus

Answer 27

A: Thumb IP flexion
N: Median C7-T1

Question 28

Flexor digitorum

Answer 28

A: 2nd-3rd digit distal IP flexion
N: Median (C7-T1)

Question 29

Abductor pollicis brevis

Answer 29

A: Thumb abduction
N: Median (C6-T1)

Question 30

Flexor Pollicis Brevis

Answer 30

A: Thumb MCP Flexion
N: Median C6-T1

Question 31

Opponens Pollicis

Answer 31

A; Thumb Opposition

N: Median (C8-T1)

Question 32

Lumbricals

Answer 32

A: 2nd-5th digit MCP flexion, IP extension
N: C8-T1

Question 33

Brachioradialis

Answer 33

A: Elbow Flexion
N: Radial (C5-C6)

Question 34

Triceps Brachii, aconeous

Answer 34

A: Elbow Extension
N: Radial C6-C8

Question 35

Extensor carpi Radialis

Answer 35

A: Wrist Extension (ulnar)
N: Radial C6-C8

Question 36

Extensor Digitorium

Answer 36

A: 2nd-5th digit MCP, IP extension
N: Radial C6-C*

Question 37

Extensor Carpi Ulnaris

Answer 37

A: Wrist ulnar extension
N: Radial C6-C8

Question 38

Supinator

Answer 38

A: Forearm Supinator
N: Radial C5-C6

Question 39

Abductor Pollicis Longus

Answer 39

A: Thumb MCP abduction
N: Radial C7-C8