Deltoid
- Origin - Lateral third of clavicle, acromion, and spine of scapula
- Insertion - Deltoid tuberosity of humerus
Axillary
- Action - Abducts, adduucts, flexes, extends, and rotates arm medially
Supraspinatus
- Origin - Supraspinous fossa of scapula
- Insertion - Superior facet of greater tubercle of humerus
Suprascapular Infraspinatus
- Origin - Infraspinous fossa
- Insertion - Middle facet of greater tubercle of humerus
Suprascapular
- Action - Rotates arm laterally
Subscapularis
- Origin - Subscapular fossa
- Insertion - Lesser tubercle of humerus
- Nerve - Upper and lower subscapular
- Action - Adducts and rotates arm medially
Teres major
- Origin - Dorsal surface of inferior angle of scapula
- Insertion - Medial lip of intertubercular groove of humerus
- Nerve - Lower subscapular
- Action - Adducts and rotates arm medially
Teres minor
- Origin - Upper portion of lateral border of scapula
- Insertion - Lower facet of greater tubercle of humerus
Axillary
- Action- Rotates arm laterally
Latissimus dorsi
- Origin - Spines of T7 T12 thoracolumbar fascia, iliac crest, ribs
- Insertion - Floor of bicipital groove of humerus
Thoracodorsal
- Action - Adducts, extends, and rotates arm medially
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