1. What 2 muscles does the radial nerve innervate proximal to the spiral groove? What sensory nerves does it give off?
2. What 3 forearm muscles does the radial nerve innervate distal to the spiral groove?
3. Where does the radial nerve split into the superficial radial nerve (sensory) and the posterior interosseous nerve (motor)?
4. What 8 muscles are innervated by the posterior interosseous nerve?
Answers:
1. Triceps and anconeus. It gives off the posterior cutaneous nerve and the lower lateral cutaneous nerve.
2. Brachioradialis, ECRL, ECRB.
3. At the lateral epicondyle.
4. Supinator, EDC, EDM, ECU, APL, EPL, EPB, EIP.
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1 comment:
ERCB is innervated by the PIN. This is poorly clarified in Cuccurullo's PM&R Board Review.
Remembering PIN supplied muscles is easy if you know your dorsal wrist compartment muscles. It supplies ALL of them EXCEPT ECRL (in the 2nd compartment with the PIN supplied ECRB). Then just add Supinator to the list and you have them all.
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