What are the structual differences between the muscle types?

There are 3 muscle types: structural, cardiac and smooth. Skeletal and cardiac muscles are both striated, however cardiac has fainter striations.Skeletal muscle is also voluntary, multi-nucleated (has many nuclei per cell) and regularly arranged. Whereas cardiac muscle is involuntary and uninucleated. These muscles also differe in length, skeletal being longer of the two. Cardiac and smooth muscles are both involuntary, uninucleated and have gap junctions. They differ structurally as cardiac is branched and has intercalated discs connected to the muscle cells. Whilst involuntary muscle structure is spindle shaped with pointed ends and are not striated at all.