Structure of muscle. Muscle as the body.

The muscle consists of bundles of striated (striated) muscle fibers. These fibers, running parallel to each other, bind loose connective tissue (endomysium) In the beams of the first order. Several of these primary beams are connected, in turn, forming tufts of the second order, etc. In general, the muscle bundles of all orders combined connective tissue sheath -- perimysium, Making the muscle belly. Connective layer, existing between muscle bundles, the ends of the muscle belly, moving in the tendon of the muscle.

Since muscle contraction caused by impulses from the central nervous system, each muscle connected with her nerve: afferent, is the conductor of "muscle sense" (motor analyzer, according to Pavlov), and efferent, resulting in her nervous excitement. In addition, the muscle suit sympathetic nerves, through which the muscle in a living organism is always in a state of some reduction, called a tone. In muscle occurs very energetic metabolism, and therefore they are very richly supplied with blood vessels. Vessels penetrate the muscle from its inner side in one or more points, called gate muscle. In muscle gates together with vessels and nerves are, with whom they branch out in the thickness of the muscle, respectively, muscle bundles (along and across).

In differentiated muscle activity reduces part -- abdomen and the passive part, with which it is attached to the bones -- tendon. The tendon consists of dense connective tissue and has a brilliant light-golden color, sharply distinguished from the reddish-brown color of the abdomen muscles. In most cases, the tendon is located on both ends of the muscle. When it is very short, it seems that muscle starts from the bone or attached directly to her belly. Tendon, in which the metabolism is less supplied with blood vessels poorer abdominal muscles. Thus, skeletal muscle consists not only of striated muscle tissue, but also from different types of connective tissue (perimysium, tendon), from the nervous (nerves of the muscles) from the endothelium and smooth muscle fibers (the vessels). However, the dominant is transversely striated muscle tissue, whose properties (contractility) and determines the function of muscle as an organ reduction. Each muscle is a separate body, ie, a holistic education, with its specific, a characteristic shape, structure, function, development and position in the body.