Peripheral nerve branches and compression neuropathy

The branches of the three main terminal branches of the brachial plexus can be difficult to remember. Even worse is trying to remember where all of those pesky compression points are and why it is that you get some symptoms with some and not others.

This diagram attempts to clarify the branches of the radial, median, and ulnar nerves and where they can get squished along the way. There are of course, slight anatomic variations, but this is a good starting point. I’ve even included where the famed Martin-Gruber anastomosis and the Riche-Cannieu anastomosis are, since they can make an otherwise (totally not) straightforward examination of a median or ulnar nerve palsy more muddied since both carry motor fibers between the two nerves.

Most interestingly is John Struthers, whose namesake structures compress the median nerve as a ligament and the ulnar nerve as an arcade.

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