intrinsic (in-trin´sik)

1. Belonging entirely to a part. 2. In anatomy, denoting those muscles whose origin and insertion are both within the structure under consideration, distinguished from the extrinsic muscles which have their origin outside of the structure under consideration; applied especially to the limbs but also to the ciliary muscle as distinguished from the recti and other orbital muscles which are outside the eyeball.essential (6) ; [L. intrinsecus, on the inside]


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