Upper Body Muscles Actions and Nerve

Question 1

Sternoclediomastoid

Answer 1

Action
Bilaterally: flex neck
Unilaterally: laterally flex and rotate head to side opposite contracting muscle

Nerve: Spinal Accessory

Question 2

Scalenes

Answer 2

Action
Bilaterally: flex neck
Unilaterally: laterally flex and rotate head to side opposite contracting muscle

Nerve: C3-C5 nerve roots

Question 3

Pectoralis Major

Answer 3

Action
Adducts and IR shoulder
Clavicular Head: Shoulder Flexion (IR)
Horizontal Adduction

Nerve: lateral pectoral nerve

Sternocostal head: Shoulder adduction-oblique

nerve: medial and lateral pectoral nerve

Question 4

Rhomboids

Answer 4

Action:
scapular retraction
Scapular elevation

nerve: dorsal scapular

Question 5

Serratus Anterior

Answer 5

Action: Scapular protraction
scapular elevation

Nerve: Long thoracic

Question 6

Upper Traps

Answer 6

Action: Cervical extension (B)
Scapular elevation (B)
Cervical lateral flexion
Cervical opposite rotation

Nerve: Spinal Accessory

Question 7

Middle Traps

Answer 7

Action: Scapular retraction

Nerve: Spinal accessory

Question 8

Lower Traps

Answer 8

Action: Scapular retraction
Scapular depression

Nerve : Spinal Accessory

Question 9

Deltoid

Answer 9

Action:
Anterior: flexes and IR
Middle: Abduction
Posterior: Extends and ER

Nerve: Axillary

Question 10

Supraspinatus

Answer 10

Abduction
Stabilizie humeral head

nerve: suprascapular

Question 11

Infraspinatus

Answer 11

Action: ER

Nerve: Suprascapular

Question 12

Teres Minor

Answer 12

Action: ER

Nerve: Axillary

Question 13

Subscapularis

Answer 13

Action: Adduction and IR

Nerve: Upper and Lower Subscapular

Question 14

Teres major

Answer 14

Extension, adduction, IR

nerve: lower subscapular

Question 15

Lats Dorsi

Answer 15

Extends, Adducts, IR

nerve: thoracodorsal

Question 16

Biceps Brachii

Answer 16

Action: Shoulder Flexion
Elbow flexion (supination)

Nerve: musculocutaneous

Question 17

Coracobracialis

Answer 17

Action: Shoulder flexion
Shoulder adduction

Nerve: Musculocutaneous

Question 18

Triceps

Answer 18

Extends forearm, assist in shoulder and elbow extension

Nerve: radial

Question 19

Brachioradialis

Answer 19

Elbow Flexion (neutral)

Nerve: Radial

Question 20

Bracialis

Answer 20

Elbow flexion (pronation)

Nerve: Musculocutaneous

Question 21

Supinator

Answer 21

Forearm Supination

Nerve: Radial

Question 22

Pronator teres

Answer 22

Forearm pronation
Elbow Flexion

Nerve: Median

Question 23

Pronator Quadratus

Answer 23

Forearm pronation

Nerve: median

Question 24

Flexor Capri Ulnaris

Answer 24

Wrist flexion
wrist ulnar devation
weak elbow flexion

Nerve: ulnar

Question 25

Flexor Carpi Radialis

Answer 25

wrist flexion wirst radial devation weak elbow flexion Nerve: median

Question 26

Palmaris Longus

Answer 26

Wrist flexion Weak elbow flexion Nerve: median

Question 27

Extensor Carpi Ulnaris

Answer 27

wrist extension wirst ulnar devation Nerve: radial

Question 28

extensor carpi radialis longus

Answer 28

wrist extension wrist radial deviation weak elbow flexion nerve: radial

Question 29

extensor carpi radialis brevis

Answer 29

wrist extension wrist radial deivation nerve: radial

Question 30

Extensor Indicis

Answer 30

2nd MCP/IP extension nerve: radial

Question 31

Extensor Digiti Minimi

Answer 31

5th MCP/IP extension Nerve: radial

Question 32

Palmar Interossei

Answer 32

MCP addcution MCP flexion IP extension Nerve: ulnar

Question 33

Dorsal Interossei

Answer 33

MCP abduction MCP flexion IP extension Nerve: Ulnar

Question 34

Lumbaricals

Answer 34

MCP flexion IP extension Nerve: Ulnar/median

Question 35

Flexor Digitorum Superificalis

Answer 35

PIP flexion MCP flexion weak wrist flexion nerve: median

Question 36

Flexor Digitorum Profundus

Answer 36

DIP flexion MCP flexion weak wrist flexion Nerve: Ulnar/ Median

Question 37

Psoas Major

Answer 37

Hip flexion nerve: femoral

Question 38

Psoas Minor

Answer 38

Trunk flexion Nerve: Lumbar Plexus

Question 39

Iliacus

Answer 39

Hip flexion Nerve: femoral

Question 40

TFL

Answer 40

Hip abduction Hip IR Hip flexion Nerve: Superior Gluteal

Question 41

Glut Max

Answer 41

Hip Extension/ ER (with knee flexed) Nerve: Inferior Gluteal

Question 42

Glut Med

Answer 42

Hip abdution Hip IR nerve: Superior Gluteal

Question 43

Glut Min

Answer 43

Hip abduction Hip IR Hip flexion nerve: Superior Gluteal

Question 44

Rectus Abdominis

Answer 44

Trunk flexion Nerve: thorcodorsal

Question 45

Transverse Abdominis

Answer 45

Trunk Stabilization Nerve: thoracodorsal

Question 46

External Oblique

Answer 46

Trunk Flexion Trunk rotation (opposite) Trunk lateral flexion (same)

Question 47

Internal Oblique

Answer 47

trunk flexion trunk rotation (same) trunk lateral flexion (same)