what are the major organs of the muscular system
Top 10 facts about the world. The different organs in the muscular system include cardiac muscles, smooth muscles and skeletal muscles. A complete muscle â consisting of muscle fibers, connective tissue, nerve tissue and blood tissue â is considered one organ by itself. There are roughly 600 organs in the muscular system, and these muscles make up about 40 percent of the body. These organs can be divided into four major groups: the muscles of the lower extremity, the trunk muscles, the muscles of the upper extremity and head-and-neck muscles.