NBME 23 Infraspinatus (NBME Answers)

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Retired NBME 23 Answers

nbme23/Block 3/Question#41 (reveal difficulty score)
A previously healthy 45-year-old man comes to ...
Infraspinatus 🔍 / 📺 / 🌳 / 📖
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+12 upvote downvote
submitted by ∗sugaplum(487)

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always remember them in order with formula, SITS=AEEI
and the two on the END are AD-DUCTION

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makinallkindzofgainz The supraspinatus AB-ducts. The Subscapularis ADDucts +

makinallkindzofgainz disregard my comment, I misread what you meant +

drzed How are you supposed to remember which S is which? +2

drschmoctor @drzed "Supra" = on top, so the 1st S is for supraspinatus. +1

usmleaspirant2020 according to Physeo : INFraspinatus--EXternal rotaTION------INF-ECTION +

destinyschild wow, sugapulm, that mnemonic is gold. you are gold. +2

+5 upvote downvote
submitted by ∗yotsubato(1208)

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So this question is describing a guy having difficulty externally rotating his arm while the forearm is flexed. He is able to supinate while his arm is extended (because of the supinator muscle and biceps). In the rotator cuff, only the infraspinatus performs external rotation, so that is the best choice.

Biceps works fine here

Subscapularis performs internal rotation.

Supraspinatus performs abduction

Triceps provides extension of forearm.

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bigjimbo technically rotator cuff infraspinatous and teres minor do ER (but teres minor is not a answer choice0 +9

+1 upvote downvote
submitted by ∗skonys(58)

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This exam writer probably has the nicest shoulders ever. It was most all the anatomy questions.

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-2 upvote downvote
submitted by ∗paperbackwriter(161)

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INfraspinatus goes OUT (i.e. external rotation) and therefore supraspinatus does opposite (internal rotation).

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paperbackwriter Apologies! Subscapularis does internal rotation. +2

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