Muscles That Move the Arm

Pectoralis Major

O: cartilages of ribs 2-6, body of sternum, and inferior, medial portion of clavicle (“From ribs two to six, sternum in the mix, and the low-mid clavicle sticks.”)

I: crest of greater tubercle and lateral lip of intertubercular of humerus

A: flexion, adduction and medial rotation of shoulder

Latissimus Dorsi

O: spinous process of inferior thoracic and all lumbar/ sacral vertebrae, ribs 8-12 and thoracolumbar fascia

I: floor of bicipital groove (intertubercular sulcus) of humerus

A: extension, adduction and medial rotation of shoulder

Deltoid

O: clavicle and scapula (acromion and adjacent scapular spine)

I: deltoid tuberosity of humerus

A: W= abduction of shoulder, A= flexion and medial rotation, P= extension and lateral rotation

Teres Major

O: inferior angle of scapula

I: medial lip of intertubercular sulcus

A: extension and medial rotation

Subscapularis

O: subscapular fossa

I: lesser tubercle

A: medial rotation

Supraspinatus

O: supraspinous fossa

I: greater tubercle

A: abduction at shoulder

Infraspinatus

O: infraspinous fossa

I: greater tubercle

A: lateral rotation

Teres Minor

O: lateral border of scapula

I: greater tubercle

A: lateral rotation and adduction

Coracobrachialis

O: coracoid process

I: medial margin of shaft of humerus

A: adduction and flexion at shoulder

Triceps Brachii

O: Lat= superior lateral margin of humerus, Long= infraglenoid tubercle,  Med: posterior surface of humerus/inferior to radial groove

I: olecranon of ulna

A: elbow extension, Long head also does extension/ adduction at shoulder 

Biceps Brachii

O: L= supraglenoid tubercle S= coracoid process 

I: radial tuberosity

A: flexion at shoulder and elbow