Myoblasts

A myocyte (also known as a muscle cell or muscle fiber) is the type of cell found in muscle tissue. They are long, tubular cells that arise developmentally from myoblasts to form muscles. There are various specialized forms of myocytes: cardiac, skeletal, and smooth muscle cells, with various properties. Cardiac myocytes are responsible for generating the electrical impulses that control the heart rate, among other things.

Read more about Myoblasts:  Terminology, Myofibrils, Functional Control, Myoblasts