Accessory muscles of the forearm, wrist and hand

Last revised by Dr Joachim Feger on 10 Sep 2021

Accessory muscles of the forearm, wrist and hand are muscular, usually asymptomatic, anatomical variants that might be encountered on imaging studies and confused with pathologic conditions.

The following accessory muscles around the forearm, wrist and hand have been described 1-6:

Accessory muscles look like other muscles in imaging studies.

The radiological report should include a description of the following features:

  • accessory muscle with location
  • nerve compression syndromes

Accessory muscles might mimic pathological conditions such as tumors or mass lesions. 

Accessory muscles of the forearm, wrist, and hand have been implicated in the following clinical conditions 1-5:

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