Accessory muscle
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An accessory muscle is a relatively rare anatomic duplication of a muscle that may appear anywhere in the muscular system. Treatment is not indicated unless the accessory muscle interferes with normal function.[1] Examples are the sternalis muscle, accessory soleus muscle and extensor digitorum brevis manus.
An accessory muscle can also refer to a muscle that is not primarily responsible for movement but does provide assistance.[1] Examples of such muscles are the accessory muscles of inspiration where the sternocleidomastoid and the scalene muscles (anterior, middle and posterior scalene) are typically considered accessory muscles of breathing.[2]
See also
References
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