Molecular Biology of the Cell 5th Edition (2007) pgs 1464 Alberts et.al.
Myoblast cells are progenitor cells that form muscle cells. They can be considered as the precursors to skeletal fibres. Special proteins expressed by specific genes help in the specific proliferation of myoblast cells. Various myoblast cells fuse together to form a bundle of cells with a specific function. Thus forming multi-nucleated skeletal muscles fibres. Myoblast cells donot fuse to form smooth or cardiac muscle cells.