Axial and Appendicular Muscles

Axial muscles are located along the body's midline and connect to the axial skeleton, including the skull, spine, ribs, and sternum. They control facial expressions, head and neck movements, speaking, and eating. Appendicular muscles, by contrast, attach to the pectoral girdle, pelvic girdle, and limbs, providing stability and enabling movement during activities like walking and running.

The thoracic muscles and abdominal muscles, including the rectus, oblique, and transverse muscles, form the anterolateral walls of the trunk. These muscles of the abdomen provide structural support and stability to the torso, protecting internal organs and enabling trunk movements and breathing.

Axial muscles in the head and neck are vital for facial expressions, talking, and eating. Additionally, some neck muscles work with posterior trunk muscles to assist in movements of the vertebral column. These muscles of the vertebral column coordinate to enable flexion, extension, and rotation of the spine.

Appendicular muscles stabilize and support moving structures during physical activities like walking and running. Upper limb muscles extend from the shoulders to the hands, enabling precise hand movements. Lower limb muscles stretch from the hips to the feet, providing mobility and balance during locomotion and weight-bearing activities.

The lower axial skeleton contains muscles that extend between the sacrum and pelvic girdle, creating the pelvic floor. These muscles of the pelvic floor and perineum provide support for pelvic organs and contribute to core stability during movement and posture maintenance.

Upper appendicular muscles extend from the shoulders down to the hands, enabling intricate tasks and arm movements. Lower appendicular muscles stretch from the hips to the feet, ensuring mobility and balance. Both regions contain muscles that attach to the pectoral and pelvic girdles, respectively, allowing coordinated limb function.

Axial muscles in the head and neck are essential for creating facial expressions and controlling jaw and mouth movements during eating. These muscles for facial expressions work in coordination with muscles around the mouth and eyes to produce the varied expressions humans use for communication and food manipulation.