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Extrinsic muscles. Definition. noun. A group of muscles lying superficially on a structure, in contrast to intrinsic muscles, which are located deeply. Supplement.For instance, the extrinsic muscles of the tongue include genioglossus muscle, hyoglossus muscle, styloglossus muscle, and palatoglossus muscle.Since they are extrinsic muscles, they are located on the surface of the tongue, and attach the tongue to other structures.xtrinsic muscles. Definition. noun. A group of muscles lying superficially on a structure, in contrast to intrinsic muscles, which are located deeply. Supplement.
Muscles acting on the hand can be divided into two groups; extrinsic and intrinsic muscles. 1  The extrinsic muscles are located in the anterior and posterior compartments of the forearm.2  They control crude movements, and produce a forceful grip.3  The intrinsic muscles of the hand are located within the hand itself.uscles acting on the hand can be divided into two groups; extrinsic and intrinsic muscles. 1  The extrinsic muscles are located in the anterior and posterior compartments of the forearm. 2  The intrinsic muscles of the hand are located within the hand itself.