So this is one z line, this is a second z line and this is our sarcomere. And many of these sarcomeres are connected to form the myofibro. Now many of these myofibers are placed inside the cytoplasm of the muscle cell. So the muscle cell is also known as the muscle fiber or the myocide. And inside our muscle cell we contain many of these myofibrils as shown in the following diagram. So if we take a cross section of the muscle cell we get the following diagram.