- intrinsic muscle
- a muscle that is contained entirely within the organ or part it acts on. For example, there are intrinsic muscles of the tongue, whose contractions change the shape of the tongue.
* * *a muscle that is contained (origin, belly, and insertion) in the same limb or structure.
Intrinsic muscle exemplified by the pronator quadratus, which originates at the ulna and inserts into the radius.
Medical dictionary. 2011.
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