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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.
â¢ Assess both extrinsic and intrinsic median innervated muscles; check for anterior interosseous nerve branch versus median nerve proper function. â¢ Extrinsic muscles provide pronation, wrist flexion, thumb interphalangeal joint flexion, finger proximal interphalangeal joint flexion and index +/- long finger distal interphalangeal joint flexion.