Origin: Supraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Action: Abducts humerus

Innervation: Suprascapular Nerve (C5)

Origin: Infraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Action: Lateral rotation of humerus

Innervation: Suprascupular Nerve (C5-C6)

Origin: Lateral border of scapula

Insertion: Greater tubercle of humerus

Action: Lateral rotation of humerus

Innervation: Axillary Nerve (C5)

Origin: Subscapular fossa of scapula

Insertion: Lesser tubercle of humerus

Action: Medical rotation of humerus

Innervation: Subscapular Nerve (C5-C6)

Origin: Clavicle and scapula

Insertion: Deltoid tuberosity of humerus

Action: Abducts humerus

Innervation: Axillary Nerve (C5-C6)

Origin: Coracoid process of scapula

Insertion: Median margin of humerus shaft

Action: Adducts and flexes humerus

Innervation: Musculocutaneous Nerve

Origin: Inferior angle of scapula

Insertion: Intertubercular groove of humerus

Action: Extends, adducts, medically rotates humerus

Innervation: Lower Subscapular Nerve (C5-C7)

Origin: Spinous processes of lower thoracic, and all lumbar vertebrae, ribs 8-12, and lumbrodorsal fascia

Insertion: Intertubercular groove of humerus

Action: Extends, adducts, medically rotates humerus

Innervation: Thoracodorsal Nerve (C6-C8)

Origin: Ribs 2-6, body of sternum, and inferior medical clavicle

Insertion: Greater tubercle and intertubercular groove of humerus

Action: Flexes, adducts, medically rotates humerus

Innervation: Pectoral Nerve (C5-T1)

Origin: Ventral surfaces of ribs 3-5

Insertion: Coracoid process of scapula

Action: Depresses, protracts, downward rotates SG

Innervation: Medical Pectoral Nerve (C8-T1)