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Intrinsic muscles. Definition. noun. A group of muscles located within or situated deeper in a structure, in contrast to extrinsic muscles located rather superficially. Supplement. Based on the above definition, the intrinsic muscles refer to the muscles closest to the axial and appendicular skeleton.For example, the intrinsic muscles of the hand are those lying deeper in the hand, such as the interossei and lumbrical muscles.ased on the above definition, the intrinsic muscles refer to the muscles closest to the axial and appendicular skeleton. For example, the intrinsic muscles of the hand are those lying deeper in the hand, such as the interossei and lumbrical muscles.
Best Answer: The extrinsic muscles control the movement of the eyes.The extrinsic muscles are controlled by the somatic nervous system(voluntary) The intrinsic muscles control the lens and pupil. The intrinsic eye muscles, (including the iris sphincter, radial pupilodilator muscles and the ciliarymuscle), are under the control of the autonomic nervous system(involuntary) Source(s):