Cardiac muscles and skeletal muscles are also different in their shape. While the cardiac muscles are semi-spindle, the skeletal muscles are cylindrical in shape. Another difference is that the cardiac muscles are short in comparison to skeletal muscles. The skeletal muscles are attached to the bone through tendons. The skeletal muscles also contain myoblasts, which form the fibers in the muscles. The cardiac muscles are seen in the myocardium of the heart. The cardiac muscles contain intercalated discs and T-tubules, which connects the myocyte to the synctium. The skeletal muscles are tightly bound together when compared to cardiac muscles.