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Microscopic anatomy involves the use of optical instruments in the study of the tissues of various structures, known as histology, and also in the study of cells.The history of anatomy is characterized by a progressive understanding of the functions of the organs and structures of the human body.Macroscopic anatomy, or gross anatomy, is the examination of an animal's body parts using unaided eyesight.Gross anatomy also includes the branch of superficial anatomy.

Smooth muscle has no striations when examined microscopically.Skeletal muscle contracts rapidly but has a limited range of extension.It is found in the movement of appendages and jaws.Their bodies tend to be dorso-ventrally flattened, they usually have five pairs of gill slits and a large mouth set on the underside of the head.The dermis is covered with separate dermal placoid scales.

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