Shoulder Muscles (action, origin, insertion, innervation)
Subscapularis: action
Action: Medially rotates arm
Rhomboid Major: innervation
Dorsal Scapular Nerve
Rhomboid Major: action
Elevates and retracts (adducts) scapula; inferiorly rotates scapula
Teres Major: origin
Elongate oval area on the posterior surface of the interior angle of the scapula
Teres Minor: insertion
Inferior facet on the posterior surface of the greater tubercle of humerus
Teres Major: innervation
Inferior subscapular nerve
Subscapularis: innervation
Innervation: upper and lower subscapular nerves
Subscapularis: insertion
Insertion: lesser tubercle of humerus
Infraspinatus: origin
Medial 2/3 of the Infraspinous fossa of the scapula and the deep fascia that covers the muscle
Supraspinatus: origin
Medial 2/3 of the supraspinous fossa of scapula and the deep fascia that covers the muscle
Teres Major: insertion
Medial lip of the intertubercular sulcus on the anterior surface of the humerus
Teres Major: action
Medial rotation and extension of the arm at the glenohumeral joint
Infraspinatus: insertion
Middle facet on the posterior surface of the greater tubercle of humerus
Supraspinatus: insertion
Most superior facet on the greater tubercle of humerus
Subscapularis: origin
Origin: Subscapular fossa of scapula
Rhomboid Major: insertion
Posterior surface of Medial Border of scapula from the root of the spine of the scapula to the inferior angle
Supraspinatus: action
Rotator cuff muscle; initiation of abduction of arm to 15 degrees at glenohumeral joint
Teres Minor: action
Rotator cuff muscle; laterally rotates arm at glenohumeral joint
Infraspinatus: action
Rotator cuff muscle; laterally rotates arm at the glenohumeral joint
Rhomboid Major: origin
Spinous process of T1-T5 vertebrae Intervening supraspinous ligaments
Supraspinatus: innervation
Supracapular nerve
Teres Minor: innervation
axillary nerve
Infraspinatus: innervation
suprascapular nerve
Teres Minor: origin
upper 2/3 of a flattened strip of bone on the posterior surface of the scapula immediately adjacent to the lateral border of the scapula