Arm muscles OIA

coracobrachialis

O- coracoid process of scapula

I- humerus

A- adduction and flexion at shoulder

deltoid

O- clavicle; spine and acromion of scapula

I- deltoid tuberosity of humerus

A- abducts arm; anterior fibers flex and medially rotate the arm; posterior fibers extend and laterally rotates arm

supraspinatus

O- supraspinatus fossa

I- greater tubercle of humerus

A- abducts arm

infraspinatus

O- infraspinatus fossa of scapula

I- greater tubercle of humerus

A- lateral rotation of humerus at shoulder

subscapularis

O- subscapular fossa of scapula

I- lesser tubercle of humerus

A- medially rotates the arm; assists extension of arm

teres major

O- lateral border of scapula

I- intertubercular sulcus of humerus

A- extension and rotation of humerus at shoulder

teres minor

O-lateral border of scapula

I- greater tubercle of humerus

A- rotation and adduction of humerus at shoulder

latissimus dorsi

O- spinous process of thoracic and lumbar vertebrae; iliac crest

I- intertubercular groove of humerus

A- extends the arm and rotates the arm medially

pectoralis major

O- clavicle; sternum

I- greater tubercle of humerus

A- flexes and adducts the arm, medially rotates the arm