MICROANATOMY

Detailed explanation-1: -Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle may be made up of hundreds, or even thousands, of muscle fibers bundled together and wrapped in a connective tissue covering. Each muscle is surrounded by a connective tissue sheath called the epimysium.

Detailed explanation-2: -Skeletal muscle cells are the individual contractile cells within a muscle and are more usually known as muscle fibers because of their longer threadlike appearance.

Detailed explanation-3: -A skeletal muscle cell is surrounded by a plasma membrane called the sarcolemma with a cytoplasm called the sarcoplasm. A muscle fiber is composed of many fibrils, packaged into orderly units.

Detailed explanation-4: -The two most essential myofilaments that make up the contractile elements of the muscle fiber are actin and myosin. They are arranged distinctively in a striated pattern to form the dark A band, the light I band, and the fundamental unit of contraction, also referred to as a sarcomere.

Detailed explanation-5: -Skeletal muscle cells A single muscle such as the biceps in a young adult male contains around 253, 000 muscle fibers. Skeletal muscle fibers are the only muscle cells that are multinucleated with the nuclei often referred to as myonuclei.