Page 2 (scapular region + rotator cuff)

deltoid origin

lateral 1/3 of clavicle, acromion, and spine of scapula

deltoid insertion

deltoid tuberosity of humerus

deltoid action

abducts glenohumeral joint

anterior part - flexes and medially rotates glenohumeral joint

posterior part - extends and laterally rotates glenohumeral joint

deltoid innervation

axillary n. C5-6

teres major origin

posterior surface of inferior angle of scapula

teres major insertion

medial lip of intertubercular groove of humerus

teres major action

adducts and medially rotates glenohumeral joint

teres major innervation

lower subscapular n. C5-6

supraspinatus origin

supraspinous fossa of scapula

supraspinatus insertion

superior facet of greater tubercle of humerus

supraspinatus action

initiates and assists with abduction of glenohumeral joint

supraspinatus innervation

suprascapular n. C4-6

infraspinatus origin

infraspinous fossa of scapula

infraspinatus insertion

middle facet of greater tubercle of humerus

infraspinatus action

laterally rotates glenohumeral joint

infraspinatus innervation

suprascapular n. C5-6

teres minor origin

middle part of lateral border of scapula

teres minor insertion

inferior facet of greater tubercle of humerus

teres minor action

laterally rotates glenohumeral joint

teres minor innervation

axillary n. C5-6

subscapularis origin

subscapular fossa (anterior surface of scapula)

subscapularis insertion

lesser tubercle of humerus

subscapularis action

medially rotates and adducts glenohumeral joint

subscapularis innervation

lower and upper subscapular nn. C5-7