Pectoralis major

o: Clavicle and sternum

i:  Intertublar groove of humerus

a: Flexion, medial rotation and adduction (butterfly stroke)

Important due to primate movement of brachiation

Latissimus dorsi

o:   Lower vertebrae spine T7-L5, iliac crest

 i:   Intertubercular groove of humerus

 a:  Medial rotation, adduction (monkey bar action or pulling on oars)

Deltoid

 o:  Acromion and spine of scapula; clavicle

 i:  Deltoid tuberosity of humerus

 a:  Abduction, swing arms with walking

Teres major

o:  Inferior angle of scapula

i:   Proximal shaft of humerus

a:  Adduction and medial rotation

SYNERGIST MUSCLE for arm swinging

Corachobrahialis

o:  Coracoid process of scapula

 i:  Medial aspect of humerus shaft

 a:  Abduction

Supraspinatus

o:  Supraspinous fossa of scapula

i:   Tubercle of humerus

a:  Abduction of humerus

ANTAGONISTIC MUSCLE to prime movement