There are approximately 640 skeletal muscles within the typical human, and almost every muscle constitutes one part of a pair of identicalbilateral muscles, found on both sides, resulting in approximately 320 pairs of muscles, as presented in this article. Nevertheless, the exact number is difficult to define because different sources group muscles differently, regarding what is defined as different parts of a single muscle or as several muscles. Examples range from 640 to 850.
The muscles of the human body can be categorized into a number of groups which include muscles relating to the head and neck, muscles of the torso or trunk, muscles of the upper limbs, and muscles of the lower limbs.
The action refers to the action of each muscle from the standard anatomical position. In other positions, other actions may be performed. These muscles are described using anatomical terminology.
Here is a image with all muscles and their names: