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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.
Smooth Muscle vs Cardiac Muscle. Most often, the term muscles mean the skeletal muscles for many of you, but there are two more types with a greater importance for survival of the animal. Smooth and cardiac muscles are the other two types. Cardiac muscles are striated, but smooth muscles are non-striated. â¢ Each cardiac muscle cell has one or more nuclei, but the smooth muscle cells are single nucleated. â¢ Cardiac muscle cells are often branched, but smooth cells are non-branched.