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muscle
abductor pollicus longus

origin
posterior radius/ulna

insertion
thumb

action
flexes and extends thumb

muscle
biceps brachii

origin
short head: coracoid process of scapula, long head: supraglenoid tubercle of scapula, tendon in intertubercular sulcus

insertion
radial tuberosity

action
flexes and supinates forearm


(deep) muscle
brachialis

(deep) origin
distal humerus

(deep) insertion
ulnar coracoid process
(deep) action
flexes forearm

muscle
brachioradialis

origin
distal humerus

insertion
styloid process of radius

action
flexes forearm

muscle
deltoid

origin
clavicle, scapula (acromion, spine)

insertion
humerus, deltoid tuberosity

action
abduction of arm

muscle
extensor carpi radialis brevis

origin
lateral epicondyle humerus

insertion
metacarpal 3

action
extends/abducts hand

muscle
extensor carpi radialis longus

origin
humerus lateral epiphysis

insertion
metacarpal 2

action
extends/abducts arm

muscle
extensor carpi ulnaris

origin
lateral epicondyle humerus

insertion
metacarpal 5

action
extends/abducts hand

muscle
extensor digitorum

origin
lateral epicondyle humerus

insertion
distal phalanges 2-5

action
prime mover extensor of digits

muscle
extensor pollicis longus/brevis

origin
dorsal ulna and radius

insertion
thumb
longus: distal phalanx
brevis: proximal phalanx

action
extend thumb

muscle
flexor carpi radialis

origin
medial epicondyle humerus

insertion
metacarpals 2, 3

action
flexor, abductor of hand

muscle
flexor carpi radialis

origin
medial epicondyle humerus

insertion
pisiform, hamate, base metacarpal 5

action
flexes, adducts hand

muscle
flexor digitorum profundus

origin
anterior ulna, coronoid process ulna

insertion
distal phalanges digits 2-5

action
flexes distal phalanges

muscle
flexor digitorum superficialis

origin
medial epicondyle humerus, coronoid process ulna, shaft of radius

insertion
middle phalanges digits 2-5

action
flexes hand and fingers

muscle
flexor pollicis longus

origin
radius anterior surface

insertion
distal thumb phalanx

action
flexes thumb

muscle
infraspinatus

origin
scapula: infraspinous fossa

insertion
humerus: greater tubercle (posterior)

action
lateral rotation of humerus

muscle
pec major

origin
clavicle, sternum, 1st six ribs

insertion
humerus, greater tubercle

action
flexes, adducts, medially rotates arm

muscle
pec minor

origin
ribs 3-5

insertion
scapula: coracoid process

action
protracts/depress scapula or elevate ribcage

muscle
pronator teres

origin
medial epicondyle humerus, coronoid process ulna

insertion
radius diaphysis

action
forearm pronation


muscle
pronator quadratus

origin
distal anterior ulna

insertion
anterior surface distal radius

action
pronates forearm

muscle
palmaris longus

origin
medial epicondyle humerus

insertion
palmar aponeurosis, skin of palm

action
tenses skin and palm

muscle
subscapularis

origin
subscapular fossa

insertion
lesser tubercle of humerus

action
humerus: medial rotator, holds humerus in glenoid cavity

muscle
supinator

origin
lateral epicondyle humerus, proximal ulna

insertion
radius proximal end

action
supinates arm

muscle
supraspinatus

origin
scapula, supraspinous fossa

insertion
humerus: greater tubercle

action
abduction of humerus

muscle
teres major

origin
scapula posterior surface