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Trapezius
action: scapula elevation
origin: vertebrae
insertion: clavicle and scapula
trapezius

rhomboid major
action: scapula adduction
origin: vertebrae
insertion: scapula
rhomboid major

rhomboid minor
action: scapula adduction
origin: vertebrae, cervical: spinous process
insertion: scapula
rhomboid minor

levator scapulae
action: scapula elevation
origin: vertebrae
insertion: scapula
levator scapulae

serratus anterior
action: scapula protraction
origin: ribs
insertion: scapula
serratus anterior
subclavius
action: clavicle depression
origin: rib 1
insertion: clavicle
subclavius
pectoralis minor
action: scapula depression
origin: ribs
insertion: scapula
pectoralis minor

muscles that position the pectoral girdle
Trapezius - scapular movements
Levator scapula - elevates scapula
Rhomboids - adduction/downward scapular rotation
Pectoralis minor - depresses/protracts shoulder
Subclavius - depresses/protracts shoulder
deltoid
action: abduction
origin: clavicle and scapula
insertion: humerus
deltoid

Supraspinatus
action: should abduction
origin: scapula, supraspinous fossa
insertion: humerus
supraspinatus

Subscapularis
action: shoulder medial rotation
origin: scapula, subscapular fossa
insertion: humerus
subscapularius
teres major
action: shoulder medial rotation
origin: scapula
insertion: humerus
teres major

infraspinatus
action: shoulder lateral rotation
origin: scapula
insertion: humerus
infraspinatus

teres minor
action: shoulder lateral rotation
origin: scapula
insertion: humerus
teres minor

coracobrachialis
action: shoulder adduction
origin: scapula, coracoid process
insertion: humerus
Coracobrachialis

pectoralis major
action: shoulder flexion
origin: sternum, ribs
insertion: humerus
pectoralis major
latissimus dorsi
action: shoulder extension
origin: vertebrae
insertion: humerus
latissimus dorsi

muscles that move the arm
Deltoid - abduction (w/supraspinatus)
Pectoralis major - flexes shoulder joint
Latissimus dorsi - extension of shoulder joint
Teres major - inserts anterior humerus; medial rotation and extension of shoulder
Teres minor - inserts posterior humerus; lateral rotation and adduction of shoulder
Supraspinatus - lateral rotation (abduction) of shoulder Infraspinatus - lateral rotation at shoulder
triceps brachii long head
action: elbow extension
origin: scapula
insertion: ulna
triceps brachii long head

triceps brachii lateral head
action: elbow extension
origin: humerus
insertion: ulna
triceps brachii lateral head

triceps brachii medial head
action: extension of arm
origin: posterior surface of humerus
insertion: ulna
triceps brachii medial head

biceps brachii long and short head
action: elbow flexion
origin: scapula
insertion: radius
biceps brachii long head

biceps brachii short head

brachialis
action: elbow flexion
origin: humerus
insertion: ulna
brachialis

brachioradialis
action: elbow flexion
origin: humerus
insertion: radius
brachioradialis

pronator teres
action: forearm protonation
origin: humerus, ulna
insertion: radius
pronator teres

supinator
action: forearm supination
origin: humerus
insertion: radius
supinator
under brachioradialis

pronator quadratus
action: forearm pronation
origin: ulna
insertion: radius

pronator quadratus
flexor carpi radialis
action: wrist flexion
origin: humerus
insertion: metacarpals
flexor carpi radialis
facing palm of hand

palmaris longus
action: wrist flexion
origin: humerus
insertion: retinaculum
palmaris longus
facing palm of hand

flexor carpi ulnaris
action: wrist flexion
origin: humerus
insertion: carpals
flexor carpi ulnaris
facing back of hand

extensor carpi radialis longus
action: wrist extension
origin: humerus
insertion: metacarpal
extensor carpi radialis longus

extensor carpi radialis brevis
action: wrist extension
origin: humerus
insertion: metacarpal
extensor carpi radialis brevis

extensor carpi ulnaris
action: wrist extension
origin: humerus
insertion: metacarpal
extensor carpi ulnaris
facing back of hand

flexor digitorium superficialis
action: finger flexion
origin: humerus, ulna
insertion: fingers/digits

flexor digitorium superficialis
underneath arm muscles, facing palm

flexor pollicis longus
action: thumb flexion
origin: radius
insertion: thumb

flexor pollicis longus
underneath arm muscles, facing palm

extensor digitorum
action: finger extension
origin: humerus
insertion: digits/fingers
extensor digitorum
facing back of hand

extensor pollicis longus
action: thumb extension
origin: ulna
insertion: digit 1, thumb
extensor pollicis longus
(shown in darker red in photo)
extensor pollicis brevis
action: thumb extension
origin: radius
insertion: digit 1, thumb
extensor pollicis brevis
(lighter color red in photo)
abductor digitorium
action: finger flexion and extension
origin: pisiform bone
insertion: digit 5
abductor digitorium

muscles that move the forearm and hand
Forearm flexors:
– Biceps brachii, brachialis, brachioradialis
• Forearm extensors:
– Triceps brachii
• Forearm pronators/supinators:
– Pronator teres, pronator quadratus, supinator
muscles that move the hand
• Wrist flexion:
– Flexor carpi ulnaris
– Flexor carpi radialis– Palmaris longus
• Wrist extension:
– Extensor carpi radialis longus
– Extensor carpi radialis brevis
– Extensor carpi ulnaris
Muscles that Move Fingers
• Most of these muscles originate in the forearm and insert upon phalanges
• Digit flexion:
– Flexor digitorium superficialis/profundus
– Flexor pollicullus brevis and longus
• Digit extension:
– Extensor digitorium
– Extensor polliculus brevis/longus
Gluteus maximus
action: hip abduction
origin: ilium
insertion: femur
gluteus maximus
gluteus medius
action: hip abduction
origin: ilium
insertion: femur
gluteus medius
under gluteus maximus

gluteus minimus
action: hip abduction
origin: ilium
insertion: femur
gluteus minimus
under gluteus medius (and maximus)

tensor fasciae latae
action: hip abduction
origin: ilium
insertion: IT band
tensor fasciae latae

Obturator externus
action: hip lateral rotation
origin: os coxae, obturator foramen
insertion: femur

obturator externus

obturator internus
action: hip lateral rotation
origin: os coxae, obturator foramen
insertion: femur
obturator internus
facing posterior

adductor magnus
action: hip adduction
origin: pubis
insertion: femur

adductor magnus
posterior view of leg

adductor brevis
action: hip adduction
origin: pubis
insertion: femur
adductor brevis

adductor longus
action: hip adduction
origin: pubis
insertion: femur
adductor longus

Pectineus
action: hip adduction
origin: pubis
insertion: femur
Pectineus
facing anterior

Gracilis
action: hip adduction
origin: pubis
insertion: tibia