The muscles of the body can be categorized into two groups: axial and appendicular muscles. Axial muscles are attached to the axial skeleton. The axial skeleton includes the bones located in the head, neck, and trunk. The function of the axial muscles is to support and move the axial skeleton, which includes the spine and skull. Appendicular muscles are the muscles of the upper and lower limbs, and they have a different function than axial muscles: they allow us to move our limbs, while also protecting them. Both types of muscles connect to the bones through tendons. Tendons are bands of thick connective tissue that transmit movement from muscles to bones.