Canadian Medical Guide > Anatomy > Musculoskeletal System > Muscles Terms and Definitions

Muscles

Medical Definition:	Contractile tissue that produces movement in animals.
Guide Notes:	Manual 21.8; as tissue: Manual 21.9, 21.52; unspecified as smooth or striated; MUSCLES, SKELETAL and MUSCLE, SMOOTH and their indentions are available; /innerv: consider also NEUROMUSCULAR JUNCTION & MUSCLE DENERVATION; /surg: consider also SURGICAL FLAPS
Also Called:	Effects, Muscular

Muscles Categories.

	Muscle Fibers - Large, multinucleate single cells, either cylindrical or prismatic in shape, that form the basic unit of skeletal muscle tissue. They consist of a soft contractile substance enclosed in a tubular sheath. They are derived from the fusion of skeletal myoblasts (MYOBLASTS, SKELETAL) into a syncytium, followed by differentiation.
	Muscle, Skeletal - Striated muscles having fibers connected at either or both extremities with the bony framework of the body. These are found in appendicular and axial muscles. (From Stedman, 25th ed)
	Muscle, Smooth - Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)
	Myocardium - The muscle tissue of the HEART composed of striated, involuntary muscle known as cardiac muscle.

Muscles Medical Definitions and Terms

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