Median nerve compression syndrome in which the patient has motor weakness of the flexor pollicis longus and the flexor digitorum profundus of the index finger without alteration in sensibility is due to:
|A||Compression of the median nerve at the elbow by the acertus fibrosus.|
|B||Compression of the median nerve in the axilla.|
|C||Compression of the anterior interosseous nerve by the arcade of Frohse.|
|D||Compression of the anterior interosseous nerve by an aberrant accessory forearm muscle.|
Compression of the anterior interosseous nerve by an aberrant accessory forearm muscle.
a. Compression of the median nerve at the elbow by the lacertus fibrosus causes symptoms at more locations than just the flexor pollicis longus and flexor profundus at the index finger, since the entire median nerve is affected.
b. Compression of the median nerve at the axilla affects both motor and sensory elements diffusely.
c. The arcade of Frohse is a fibrous band at the origin of the supinator muscle.
d. It can compress the posterior interosseous portion of the radial nerve but does not involve the median nerve.
e. The anterior interosseous portion of the median nerve can be compressed by an aberrant accessory forearm muscle (Gantzer's muscle).