Muscles Inserting on Humerus

Pectoralis Major origin

Clavicle, sternum, costal cartilage 1-6

Pectoralis Major insertion

lateral crest of intertubercular groove of humerus

Pectoralis major action

Adduction, medial rotation

Pectoralis major innervation

Medial, lateral pectoral n.

Pectoralis major blood supply

Pectoral a.

Latissimus dorsi origin

Spinous process of T8-L5, sacrum, iliac crest

Latissimus dorsi insertion

Medial crest of intertubercular groove

Latissimus dorsi action

Adduct, extend, medial rotation of arm

Latissimus dorsi innervation

Thoracodorsal n. (C6-C8)

Latissimus dorsi blood supply

Thoracodorsal a.

Deltoid origin

Spine of scapula, acromion, clavicle

Deltoid insertion

deltoid tuberosity of humerus

Deltoid action

Abduct, flex (anterior), extend (posterior) arm

Deltoid innervation

Axillary n. (C5, C6)

Deltoid blood supply

Axillary a.

Supraspinatus origin

supraspinous fossa

Supraspinatus insertion

Greater tubercle of humerus

Supraspinatus action

Abduct arm (first 15 degrees)

Supraspinatus innervation

Suprascapular n.

Superspinatus blood supply

Suprascapular a.

Infraspinatus origin

Infraspinous fossa

Infraspinatus insertion

Greater tubercle of humerus

Infraspinatus action

Lateral rotation of arm

Infraspinatus innervation

Suprascapular n. (C5, C6)

Infraspinatus blood supply

Suprascapular, circumflex a.

Teres minor origin

Lateral border of scapula

Teres minor insertion

Greater tubercle of humerus

Teres minor action

Lateral rotation of arm

Teres minor innervation

Axillary n.

Teres minor blood supply

Circumflex, posterior humeral circumflex a.

Teres major origin

Lateral border of scapula

Teres major insertion

Medial crest of intertubercular groove

Teres major action

Medial rotation, adducts arm

Teres major innervation

Subscapular n.

Teres major blood supply

Thoracodorsal, posterior humeral circumflex a.

Subscapularis origin

Subscapular fossa

Subscapularis insertion

Lesser tubercle of humerus

Subscapularis action

Medial rotation of arm

Subscapularis innervation

Subscapular n.

Subscapularis blood supply

Subscapular, circumflex scapular a.