Large Arm Model

5

latissimus dorsi

origin: iliac crest

insertion: floor of intertubercular sulcus

action: humerus extension

6

subscapularis

7

deltoid

origin: lateral 1/3 of clavicle

insertion: deltoid tuberosity

action: humerus abduction (prime mover)

8

pectoralis major

orgin: clavicle

insertion: intertubercular sulcus

action: humerus flexion

9

biceps brachii (long and short head)

orgin: short head-coracoid process; long head-glenoid cavity

insertion: radial tuberosity

action: elbow flexion/forearm supination

1

supraspinatus

orgin: supraspinous fossa

insertion: greater tubercle

action: abduction/stablization of humerus

2

infraspinatus

orgin: infraspinous fossa

insertion: greater tubercle

action: lateral rotation/stablization of humerus

4

teres minor

orgin: lateral margin of scapula

insertion: greater tubercle

action: lateral rotation/stabilization of humerus

3

teres major

orgin: scapula posterior surface

insertion: intertubercular sulcus

action: extends/adducts humerus

11

triceps brachii

orgin: long head—glenoid cavity; lateral head—posterior humerus; medial head—distal radial groove

insertion: olecranon

action: elbow extension

10

brachialis

orgin: distal protion of humerus

insertion: coronoid process

action: elbow flexion

12

pronator teres

orgin: medial epicondyle/coronoid process

insertion: midshaft of radius

action: pronate forearm

25

supinator

orgin: lateral epicondyle

insertion: radius proximal end

action: supinates forearm

14

palmaris longus

orgin: medial epicondyle of humerus

insertion: palmar aponeurosis; skin & fascia of palm

action: tenses skin & fascia of palm

13

flexor carpi ulnaris

orgin: medial epicondyle of humerus

insertion: metacarpal 2 & 3

action: flexes wrist

24

flexor digitorum superficialis

orgin: medial epicondyle of humerus

insertion: middle phalanges 2-5

action: flexes wrist

20

brachioradialis

orgin: lateral ridge at distal end of humerus

insertion: base of radius styloid process

action: synergist in forearm flexion

16

extensor carpi ulnaris

orgin: latera epicondyle of humerus

insertion: metacarpal 5 base

action: extends wrist

17

extensor digitorum

orgin: lateral epicondyle of humerus

insertion: distal phalanges 2-5

action: extends wrist

18

extensor carpi radialis brevis

orgin: lateral epicondyle

insertion: metacarpal 3 base

action: extends wrist

19

extensor carpi radialis longus

orgin: lateral supercondylar ridge of humerus

insertion: metacarpal 2 base

action: extends wrist

22

extensor pollicis brevis

orgin: ulna/radius dorsal shaft

insertion: proximal phalanx of thumb

action: extends thumb

23

extensor pollicis longus

orgin: dorsal shaft of ulna

insertion: distal phalanx of thumb

action: extends thumb

41

tendon of flexor pollicis longus

orgin: radius

action: flexes thumb