Skeletal muscles are mainly divided into two groups: the axial and the appendicular. The axial muscles present along the body's midline are primarily connected with the head, neck, and trunk regions. In the head and neck, axial muscles are vital for facial expressions, talking, eating, and various head movements. Additionally, some neck muscles assist the posterior trunk muscles, commonly referred to as the back muscles, in the movements of the vertebral column. The thoracic muscles, along with the abdominal muscles such as the rectus, oblique, and transverse, establish the anterolateral walls of the trunk. Lastly, the lower axial skeleton has muscles that extend between the sacrum and pelvic girdle, creating the pelvic floor. On the other hand, the appendicular muscles are those associated with the pectoral girdle, the pelvic girdle, and the limbs. These muscles stabilize and support the moving structures during walking, running, and other physical activities. Appendicular muscles related to the upper limb range from the shoulders to the hands, while the lower limb muscles range from the hips to the feet.