Nerves Supply to Muscles

Nerve Supply to Muscles

Muscles have two types of nerves.

  • Motor nerves (nerves related to movement): Each motor nerve sends impulses from the central nervous system (CNS) to the termination point on a muscle fiber, called the motor end plate, resulting in a muscle contraction.

  • Sensory nerves: These nerves relay information about pain and body orientation from the body to the central nervous system (CNS).

A muscle consists of special fibers, which range in length from a few inches to over three feet, and extend over the entire length of the muscle. These fibers are grouped in bundles called fasciculi, each separately wrapped in a sheath (perimysium) that holds it together.

Each muscle fiber has thread-like protein strands called myofibrils, which hold the contractile proteins myosin (thick filaments) and actin (thin filaments), whose actions are very important in muscle contraction. The ability of a muscle to contract and exert force is determined by its design, the cross-sectional area, the fiber length, and the number of fibers within the muscle. Genetics determines the number of fibers within the muscles, and training will not affect this, but training will have an impact on the other variables. Dedicated training increases the thickness of these muscle filaments, which increases both muscle size and force of contraction.

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