Upper Appendicular Muscles

supraspinatus

abducts arm

infraspinatus

laterally rotates, adducts arm

teres minor

laterally rotates, adducts arm

subscapularis

medially rotates, adducts arm

brachioradialis

flex forearm

biceps brachii long head

flex forearm (in red)

biceps brachii short head

flex forearm (in blue)

brachialis

flex forearm

triceps brachii lateral head

extend forearm (yellow)

triceps brachii long head

extend forearm (red)

triceps brachii medial head

extend forearm (green)

pronator teres

pronates forearm

flexor carpi radialis

flex wrist

palmaris longus

flex wrist

flexor carpi ulnaris

flex wrist

flexor digitorum superficialis

flex fingers 2-5 (deep muscles)

flexor pollicis longus

flex thumb

supinator

supinates forearm

flexor retinaculum

posterior view

extensor carpi radialis longus

extends wrist, abducts hand

extensor carpi radialis brevis

extends wrists, abducts hand

extensor digitorum

extends fingers 2-5

extensor indicis

extends finger 2

extensor digiti minimi

extends finger 5

extensor carpi ulnaris

extends wrist, adducts hand

extensor retinaculum

extensor pollicis longus

extends thumb

extensor pollicis brevis

extends thumb

abductor pollicis longus

abducts thumb

abductor pollicis brevis

abducts thumb (blue)

flexor pollicis brevis

flexes thumb (red)

supraspinatus origin/insertion

O= supraspinous fossa (scapula)

I= greater tubercle (humerus)

infraspinatus origin/insertion

O= infraspinous fossa (scapula)

I= greater tubercle (humerus)

teres minor origin/insertion

O= lateral border (scapula)

I= greater tubercle (humerus)

subscapularis origin/insertion

O= subscapular fossa (scapula)

I= lesser tubercle (humerus)

brachioradialis origin/insertion

O= lateral supracondylar ridge

I= styloid process (radius)

biceps brachii long head O/I

O= supraglenoid tubercle (scapula)

I= radial tuberosity (radius)

biceps brachii short head O/I

O= coracoid process (scapula)

I= radial tuberosity (radius)

brachialis O/I

O= shaft of humerus

I= ulnar tuberosity (ulna)

triceps brachii lateral head O/I

O= shaft of humerus

I= olecranon process (ulna)

triceps brachii long head O/I

O= infraglenoid tubercle (scapula)

I= olecranon process (ulna)

triceps brachii medial head O/I

O= shaft of humerus

I= olecranon process (ulna)

pronator teres O/I

O= medial epicondyle (humerus)

I= midlateral radius

flexor carpi radialis O/I

O= medial epicondyle (humerus)

I= metacarpals 2 & 3

palmaris longus O/I

O= medial epicondyle (humerus)

I= palmar aponeurosis

flexor carpi ulnaris O/I

O= medial epicondyle (humerus)

I= metacarpal 5

flexor digitorum superficialis O/I

O= medial epicondyle (humerus)

I= middle phalanges 2-5

flexor pollicis longus O/I

O= radius

I=distal phalanx I

supinator O/I

O= lateral epicondyle (humerus)

I= radius

extensor carpi radialis longus O/I

O= lateral supracondylar ridge

I= metacarpal 2

extensor carpi radialis brevis O/I

O= lateral epicondyle

I= metacarpal 3

extensor digitorum O/I

O= lateral epicondyle

I= phalanges 2-5

extensor indicis O/I

O= posterior ulna

I= phalanx 2

extensor digiti minimi O/I

O= lateral epicondyle

I= proximal phalanx 5

extensor carpi ulnaris O/I

O= lateral epicondyle

I= metacarpal 5

extensor pollicis longus insertion

distal phalanx 1

extensor pollicis brevis insertion

proximal phalanx 1

abductor pollicis longus insertion

metacarpal 1

abductor pollicis brevis insertion

proximal phalanx 1

flexor pollicis brevis insertion

proximal phalanx 1