Short notes on the structure of a muscle fibre
The muscle tissue is made up of elongated thin cells called muscle fibres and they are held together by areolar tissue. There is no intercellular tissues between the muscle cells and there is also no matrix. The cytoplasm of muscle fibres is called sarcoplasm. Embedded in the cytoplasm are a number of long, fine, parallely arranged protein fibres called Myofibrils. These are arranged along the long axis of the fiber.
The spaces between the myofirbrils are occupied by a large number of mitochondria (sarco- somes) and glycogen granules. These granules provide the energy necessary for contraction. In some instances the muscle fibres may be bounded by a special membrane called sarcolemma. The muscle fibres may have one too many nuclei.