myology of the rotator cuff

Question 1

what 4 muscles make up the rotator cuff

Answer 1

supraspinatus, subscapularis, infraspinatus, teres minor

Question 2

what is the largest and strongest rotator cuff muscle

Answer 2

subscapularis

Question 3

subscapularis origin

Answer 3

medial 2/3rds subscapular fossa and covering fascia

Question 4

subscapularis insertion

Answer 4

lesser tubercle of humerus

Question 5

subscapularis nerve supply

Answer 5

upper and lower subscapular nerve C5,6,7

Question 6

subscapularis function

Answer 6

medially rotates arm at shoulder joint

Question 7

supraspinatus origin

Answer 7

medial 2/3rds supraspinous fossa and covering fascia

Question 8

supraspinatus insertion

Answer 8

upper facet greater tubercle of humerus

Question 9

suprapinatus nerve supply

Answer 9

suprascapular nerve C5,6

Question 10

supraspinatus function

Answer 10

abducts arm at shoulder

Question 11

infraspinatus origin

Answer 11

medial 2/3rds infraspinous fossa of scapula and covering fascia

Question 12

infraspinatus insertion

Answer 12

middle facet greater tubercle of humerus

Question 13

infraspinatus nerve supply

Answer 13

suprascapular nerve C5,6

Question 14

infraspinatus function

Answer 14

lateral rotation of arm at shoulder joint

Question 15

teres minor origin

Answer 15

upper 2/3rds lateral border of scapula

Question 16

teres minor insertion

Answer 16

inferior facet greater tubercle of humerus

Question 17

teres minor nerve supply

Answer 17

upper and lower subscapular nerve C5,6,7

Question 18

teres minor function

Answer 18

laterally rotates arm at shoulder joint

Question 19

describe the role of the rotator cuff in maintaining stability of the glenohumeral joint

Answer 19

rotator cuff compresses the humeral head against the glenoid fossa
provides the fine tuning movements of the head of humerus within the glenoid labrum
keep the humeral head within the glenoid labrum