Provide a detailed description of the development of cardiac muscles

1. Develop from the visceral mesoderm surrounding the developing heart tube and will form myofibrils 2. Myoblasts join together through interconnected muscle bridges 3. Later in development some of the irregularly arranged myofibrils will cluster closer together and form Purkinje fibers that run b/n cardiac muscles 4. These muscles will function to conduct nerve impulses that initiate and regulate the contractions of the cardiac mm throughout the rest of life