A whole skeletal muscle is thought about an body organ of the muscular system. Each organ or muscle consists of bones muscle tissue, connective tissue, nerve tissue, and also blood or vascular tissue.

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Skeletal muscle vary considerably in size, shape, and also arrangement that fibers. They variety from very tiny strands such together the stapedium muscle of the middle ear to huge masses such together the muscle of the thigh. Some skeletal muscles are wide in shape and also some narrow. In part muscles the fibers are parallel to the lengthy axis of the muscle; in some they converge to a small attachment; and also in some they are oblique.

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Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle might be consisted of of hundreds, or even thousands, that muscle fibers bundled together and also wrapped in a connective organization covering. Every muscle is surrounding by a connective organization sheath called the epimysium. Fascia, connective tissue exterior the epimysium, surrounds and also separates the muscles. Parts of the epimysium task inward to divide the muscle into compartments. Every compartment has a bundle that muscle fibers. Each bundle the muscle fiber is called a fasciculus and also is surrounded by a class of connective tissue dubbed the perimysium. Within the fasciculus, each individual muscle cell, referred to as a muscle fiber, is surrounded by connective tissue referred to as the endomysium.

Skeletal muscle cells (fibers), like other body cells, are soft and fragile. The connective tissue covering furnish support and also protection for the fragile cells and allow them to resist the forces of contraction. The coverings also provide pathways for the passage of blood vessels and nerves.

Commonly, the epimysium, perimysium, and also endomysium extend beyond the fleshy part of the muscle, the belly or gaster, to type a special ropelike tendon or a broad, level sheet-like aponeurosis. The tendon and also aponeurosis form indirect attachments from muscles to the periosteum of bones or come the connective tissue of various other muscles. Commonly a muscle spans a joint and is attached come bones by tendons in ~ both ends. One of the skeleton remains fairly fixed or steady while the other end moves together a result of muscle contraction.

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Skeletal muscles have an abundant supply the blood vessels and nerves. This is directly related to the primary function of bones muscle, contraction. Before a skeletal muscle fiber deserve to contract, it has to receive an impulse from a nerve cell. Generally, one artery and at the very least one vein accompany every nerve the penetrates the epimysium that a skeleton muscle. Branches the the nerve and blood vessels monitor the connective tissue materials of the muscle that a nerve cell and also with one or more minute blood vessels referred to as capillaries.