NBME 23 Infraspinatus (NBME Answers)

need help with your account or subscription? click here to email us (or see the contact page)

NBME 23 Answers

nbme23/Block 3/Question#41 (reveal difficulty score)
A previously healthy 45-year-old man comes to ...
Infraspinatus 🔍 / 📺 / 🌳 / 📖
tags:

+12 upvote downvote
submitted by ∗sugaplum(487)

get full access to all content ⋅ pick a username

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

get full access to all content ⋅ pick a username

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)

get full access to all content ⋅ pick a username

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.

get full access to all content ⋅ pick a username

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)

get full access to all content ⋅ pick a username

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

get full access to all content ⋅ pick a username

-2 upvote downvote
submitted by ∗paperbackwriter(161)

get full access to all content ⋅ pick a username

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

get full access to all content ⋅ pick a username

paperbackwriter Apologies! Subscapularis does internal rotation. +2

Must-See Comments from nbme23

ferrero on Precapillary resistance
yotsubato on 99%
sne on Triglyceride
sajaqua1 on Area labeled ‘D’ (Spinothalamic tract, right)
stinkysulfaeggs on Hypoglycemia
hayayah on Iris
soph on Peak inspiratory pressure (alveolar): ...
seagull on Area labeled ‘C’ (Cranial nerve 8: ...
water on Dietary change
wired-in on 28.8
beeip on Binding of permeable ligand to nuclear ...
thomasalterman on Hypoglycemia
yotsubato on Inhibition of the cytochrome P450-dependent ...
seagull on Decreased sodium bicarbonate reabsorption in ...