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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.
These extrinsic eye muscles are some of the fastest contracting and most precisely controlled skeletal muscles in the human body and function as Agonist & Antagonists pairs to move the eyeball. 1  Superior and Inferior Rectus Muscles, 2  Lateral and Medial Rectus Muscles,hese muscles are called extrinsic eye muscles because their origin points are outside of the eyeballs (in the orbit) and insertion points are on the outer surface of the Sclera.