KH 2220Laura Abbott, MS, LMT

Day 15

Shoulder Muscles

Rotator Cuff

• SITS muscles– S = Supraspinatus– I = Infraspinatus– T = Teres minor– S = Subscapularis

Rotator Cuff Muscles

• Supraspinatus– O: supraspinous fossa

– I: greater tuberosity

– A: Abducts shoulder to about 45 degrees, stabilize head of humerus in glenoid cavity

Rotator Cuff Muscles

• Infraspinatus– O: infraspinous fossa

– I: greater tuberosity

– A: laterally rotates, adducts, extends, horizontally abducts shoulder, and stabilizes head of humerus in glenoid fossa

Rotator Cuff Muscles

• Teres Minor– O: superior lateral border

(superior to major)

– I: greater tuberosity

– A: laterally rotates, adducts, extends, horizontally abducts shoulder, and stabilizes head of humerus in glenoid fossa

Rotator Cuff Muscles

• Subscapularis– O: subscapular fossa

– I: lesser tuberosity

– A: internal rotation, stabilizes the head of humerus in glenoid fossa.

Acronyms

• LIPS– L = Latissimus Dorsi– I = Internal Rotation– P = Pec Major– S = Subscapularis

• EXIT– EX = EXternal rotation– I = Infraspinatus– T = Teres minor

Deltoid– O:

• anterior – outer 1/3 of clavical

• middle – boarder of acromion

• posterior – scapular spine

– I: deltoid tuberosity

– A: • ant. –shoulder flexion,

medially rotates, and horizontally adducts shoulder

• mid. – shoulder Abduction• post. – shoulder

extension, lateral rotation, and horizontal abduction

Muscles

• Teres Major– O: inferior angle of

scapula and lower ½ of lateral border of scapula

– I: intertubercle groove

– A: Adduction, some internal rotation, shoulder extension