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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.
Both your feet and your hands have extrinsic and intrinsic muscles. Extrinsic muscles originate far away from the joints that they move. For the foot, there are toe muscles that start on the shin bones and turn into tendons that attach on the ends of the toes.he intrinsic muscles are like the âcoreâ muscles of the foot. Because they are deep and donât cross over too many joints, they can work well in stabilizing and protecting the arch and structures within the foot. If the foot intrinsic muscles are weak, the foot structures are more prone to increased stress and injury.