Unit 2 - Upper Limb: Rotator Cuff (Ex. II)

Question 1

infraspinatus

Answer 1

O: infraspinous fossa of scapula
I: middle facet of greater tubercle of humerus
Inn: suprascapular N (C4-C6)
A: external (L) rotation

Question 2

teres minor

Answer 2

O: axillary border of scapula
I: I facet of greater tubercle of humerus
Inn: axillary N (C5, C6)
A: external (L) rotation; weak adduction

Question 3

subscapularis

Answer 3

O: subscapular fossa of scapula
I: lesser tubercle of humerus
Inn: subscapular N (C5, C6)
A: internal (M) rotation

Question 4

supraspinatus

Answer 4

O: supraspinous fossa of scapula
I: S facet of greater tubercle of humerus
Inn: suprascapular N (C4-C6)
A: initiates 1st 15 degrees of abduction until deltoid takes over; centers head of humerus in glenoid