The brain sends messages through the nerves telling the muscles from the forearm and hand how and when to move. Tendon sheaths comprise two levels of connective tissue: the interior layer is actually a fragile synovial membrane, as well as outer layer is thick fibrous tissue. You'll find 34 muscles https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/