The term "axial muscle" refers to a collection of muscles that are located in the central part of the body, including the trunk, neck, and head. Some synonyms for axial muscles include core muscles, central muscles, and trunk muscles. These muscles are responsible for maintaining proper posture, providing stability and support for the spine and pelvis, and allowing for movement and rotation of the torso and head. Other related terms include deep muscles, which refers to the muscles that are located beneath the superficial muscles and play a role in stabilizing the spine, and spinal extensors, which refers specifically to the muscles that extend the spine and maintain an upright posture.