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
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