-
pectoralis major
origin-medial half of clavicle, sternum, costal cartilages of ribs 1-6
insertion-lateral lip of intertubercular groove on humerus
action-flexion
-
pectoralis minor
o-external surfaces of ribs 3-5
i-coracoid process of scapula
a-depression and inferior rotation of scapula
-
serratus anterior
o-external surfaces of ribs 1-8
i-medial border of scapula
a- protraction and superior rotation of scapula
-
latissimus dorsi
o-spinous process of vertebrae T6-T12, thoracolumbar fascia, iliac crest, inferior 3 ribs
i-intertubercular groove of humerus
a-extension
-
trapezius
o-posterior surface of occipital bone, ligamentum nuchae, spinous process of thoracic vertebrae
i-lateral third of clavicle, acromion process, spine of scapula
- a-
- superior fibers: elevate scapula
- middle fibers-retract scapula
- inferior fibers-depress scapula
-
deltoid
o-lateral third of clavicle, acromion process, spine of scapula
i-deltoid tuberosity of humerus
- a-
- anterior fibers-medial rotation and flexion of arm
- middle fibers-abduction of arm
- posterior fibers-lateral rotation and extension of arm
-
rhomboid minor
o-ligamentum nuchae, spinous processes of vertebrae C7 and T1
i-medial border of scapula
a-elevates scapula
-
teres major
o-scapula, near inferior angle
i-medial lip of intertubercular groove
a-extension
-
supraspinatus
o-supraspinous fossa of scapula
i-greater tubercle of humerus
a-abduction of arm
-
infraspinatus
o-infraspinous fossa of scapula
i-greater tubercle of humerus
a-lateral rotation of arm
-
teres minor
o-lateral border of scapula
i-greater tubercle of humerus
a-lateral rotation of arm
-
subscapularis
o-subscapular fossa of scapula
i-lessser tubercle of humerus
a-abduction and medial rotation of arm
-
biceps brachii
- o-
- long head: superior margin of glenoid fossa of scapula
- short head:coracoid process of scapula
i-radial tuberosity of radius, fascia of medial forearm via bicipital aponeurosis
a-flexion n supination of forearm, flexion of arm
-
brachialis
o-anterior surface of humerus
i-coranoid process of ulna
a-flexion of forearm
-
coracobrachialis
o-coracoid process of scapula
i-medial surface of humerus
a-flexion and abduction of arm
-
triceps brachii
- o-
- long head: inferior margin of glenoid fossa of scapula
- lateral head: posterior surface of humerus
- medial head: posterior surface of humerus, inferior to origin of lateral head
i-olecranon process of ulna
a-extension of forearm
-
pronator teres
o-medial epicondyle of humerus, coronoid process of ulna
i-lateral surface of radius
a-pronation n flexion of da forearm
-
flexor carpi radialis
o-medial epicondyle of humerus
i-base of metacarpal of da second digit
a-flexion and abduction of da wrist
-
palmaris longus
o-medial epicondyle of humerus
i-flexor retinaculum, palmar aponeurosis
a-flexion of wrist
-
flexor carpi ulnaris
o-medial epicondyle of humerus, olecranon process of radius
i-medial carpal bones, metacarpal of fifth digit
a-flexion n abduction of da wrist
-
flexor pollicis longus
o-anterior surface of radius, interosseous membrane
i-distal phalanx of thumb
a-flexion of da wrist and da thumb
-
brachioradialis
o-lateral supracondylar ridge of humerus
i-lateral surface of distal radius
a-flexion of forearm
-
extensor carpi radialis longus
o-lateral supracondylar ridge of humerus
i-metacarpal of da second digit
a-extension n abduction of da wrist
-
extensor carpi radialis brevis
o-lateral epicondyle of humerus
i-metacarpal of third digit
a-extension and abduction of the wrist
-
extensor digitorum
o-lateral epicondyle of humerus
i-extensor expansions of medual four digits
a-extension of wrist and fingers
-
extensor carpi ulnaris
o-lateral epicondyle of humerus, posterior surface of ulna
i-metacarpal of the fifth digit
a-extension and adduction of da wrist
-
anconeus
o-lateral epicondyle of humerus
i-olecranon process of ulna
a-very weak extension of da forearm
-
supinator
o-lateral epicondyle of humerus, proximal ulna
i-posterior, lateral, and anterior surfaces of proximal radius
a-supination of da forearm
-
abductor pollicis longus
o-posterior surfaces of radius and ulna, interosseous membrane
i-metacarpal of thumb
a-abducts and extends thumb
-
tibialis anterior
o-lateral condyle and lateral surface of tibia, interosseous
i-medial cuneiform bone and first metatarsal
a-dorsiflexion and inversion of da foot
-
extensor digitorum longus
o-lateral condyle of tibia, medial surface of fibula, interosseous membrane
i-middle and distal phalanges of digits 2-5
a-dorsiflexion of da foot, extension of da toes
-
peroneus longus
o-head and lateral suface of fibula
i-first metatarsal and medial cuneiform
a-eversion of da foot
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