trapezius

O: ligamentum nuchae, occipital protuberance, C7, T1-T12

I: clavicle, acromion & scapular spine

A: elevates & retracts scapula

levator scapulae

O: tranverse processes of C1-C4

I: superior angle of scapula

A: elevates & retracts scapula

rhomboid major

O: spinous processes T2-T5

I: medial border of scapula

A: retracts & downwardly rotates scapula

rhomboid minor

O: spinous processes C7-T1
ligamentum nuchae

I: medial border of scapula

A: retracts & downwardly rotates scapula

serratus anterior

O: R1-R8

I: medial border of scapula

A: protraction & upward rotation of scapula

pectoralis minor

O: sternal end of R3,4,5

I: corocoid process

A: depression, downward rotation, protraction of scapula

subclavian

O: R1

I: clavicle

A: depresses & protracts clavicle

latissimus dorsi

O: spinous processes of S, L, lower T vertebrae; iliac crest and lower 4 ribs

I: crest of the lesser tubercle

A: extension, adduction, medial rotation of humerus

pectoralis major

O: clavicle, sternum, costal cartilage R2-R6

I: crest of the greater tubercle

A: flexes, adducts and medially rotates humerus

coracobrachialis

O: coracoid process

I: medial side of humerus

A: flexes and adducts humerus

deltoid

O: lateral clavicle
acromion process
scapular spine

I: deltoid tuberosity

A: anterior portion: internal rotation
middle portion: abducts arm
posterior portion: external rotation

supraspinatus

O: supraspinatus fossa

I: greater tubercle

A: lateral rotation & abduction of arm

infraspinatus

O: infraspinatus fossa

I: greater tubercle

A: lateral rotation of arm

teres minor

O: lateral border of scapula

I: greater tubercle

A: lateral (external) rotation of arm

teres major

O: inferior angle of scapula

I: crest of the lesser tubercle

A: medial (internal) rotation and adduction of arm

subscapularis

O: subscapular fossa

I: lesser tubercle of the humerus

A: internal rotation