ANATOMY MCQ SERIES DAY 1

Patient had improperly fitted axillary crutch and suffered
injury to a branch of the brachial plexus. Which is the most
likely finding?
A. Weakness of arm abduction
B. Hand of benediction
C. Ape hand
D. Cyclist palsy
E. Weakness in extending the forearm and wristdrop
The affected nerve with improperly fitted crutches
is the radial nerve. Yes, the first impulse for this
question is to think axillary nerve is the answer
because it’s an axillary crutch. BUT THAT’S
WRONG. The correct answer is radial nerve!
The axillary nerve, with the posterior humeral
circumflex artery actually courses much higher
posteriorly via the quadrangular space.
The radial nerve, along with the deep brachial
artery courses posteriorly via the triangular
interval and is more susceptible to injury from the
axilla.
Weakness of arm abduction - axillary nerve
Hand of benediction - Median nerve
Ape hand - median nerve
Cyclist palsy - ulnar nerve
Weakness in extending the forearm - radial nerve