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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.
By Ground Up Strength. The muscles that move the hand are divided into two groups, the extrinsic and intrinsic muscles. The extrinsic muscles of the hand are the powerful flexor and extensor muscles of the forearm. These muscles originate outside the hand and insert within the hand. Since they are located and originate on the forearm outside the hand itself, they are called extrinsic which comes from the Latin word extrinsecus meaning on the outside.