Petoralus Major

Upper

O- Medial half of the anterior surface of the clavicle

I- Flat tendon 2 or 3 inches wid to the lateral lip of intertubercular groove or humerus

M- Int Rot, Horiz rot, diagonal add, flexion, abd

Pectoralis major

lower fibers

O- Anterior surface of costal cartilages of the first six ribs and adjoining portion of sternum

I- Flat tendon 2 or 3 inces wide to the lateral lip of intertuberclular groove of humerus

M- int rot, horiz add, diag add, ext

add 

O- entire anterior surface of the subacapular fossa

I- lesser tubercle of humerus

M- int rot, add, ext

O- coracoid process of scapula

I- Middle of medial border of humeral shaft

M- horiz add, diag add

Deltoid

anterior

O- anterior lateral third of clavicle

I- Deltoid tuberosity on lateral humerus

M- abd, flex, horiz add, intern rot, diag add

Deltoid

Middle fibers

O- Lateral scpect of acromion

I- Deltoid tuberosity on lateral humerus

abd, hoiz abd

Deltoid

posterior

O- Inferior edge of spine of acapula

I- Deltoid tuberosity on lateral humerus

M- abd, horiz abd, ext rot, diag abd

Suprasminatus

O- Medial 2/3rds of supraspinuos fossa

I- Superiouly on greater tubercle of humerus

M- abd

Latissimus Dorsi

O- Posterior crest of ilium, back of sacrum and spinous processes of the lumbar spine and lower 6 thoracic vertebrae, slips form lower three ribs

I- medial side of intertubercular groove of humerus, just anterior to the insertion of the teres major

M- ext, add, int rot, horiz abd

Teres

Major

O- Posteriorly on inferior third of lateral border of scapula and just superior to inferior angle

I- Medial lip of intertubercular groove of humerus, just posterior to the insertion of the latissimus dorsi

M- ext, add, int rot

Infraspinatus

O- infraspinous fossa just below spin of scapula

I- posteriorly on greater tubercle of humerus

M- ext rot horiz abd, ext, diag abd

Teres

Minor

O- Posteriorly on upper and middle aspect of lateral border of scapula

I- Posteriorly on greater tubercle of humerus

M- ext rot, horiz abd, ext, diag abd

what are the muscles of the rotator cuff?

S I T S

Subscapularis

Infraspinatus

Teres Minor

Supraspinatus