Muscle – Structure and Function
Skeletal muscles (Mus - Latin: a mouse) are bundles of long fibers surrounded by connective tissue networks. There are over 640 muscles in our body. Fibrous ends of muscles, known as tendons, are attached to bones. Muscles contract and relax to bring about movement of part of the body to which they are attached. Each movement requires a coordinated activity of many muscles. Respective centers in the brain control the actions of voluntary skeletal muscles. Thus, they are under the control of our will. Muscles in the heart, bowel, urinary bladder, and blood vessels are smooth and cannot be controlled by will.
Disorders of skeletal muscles are known as myopathies. Some of these are hereditary.