axioappendicular muscles axioappendicular muscles the axioappendicular muscles are the muscles that extend between the axial and (superior or inferior) appendicular skeletons. there are two groups, the anterior axioappendicular muscles and the posterior axioappendicular muscles. anterior axioappendicular muscles the anterior axioappendicular muscles are the: pectoralis major pectoralis minor subclavius serratus anterior posterior axioappendicular muscles the posterior axioappendicular muscles are described as two sub-groups: superficial posterior axioappendicular muscles (or the extrinsic shoulder muscles) trapezius latissimus dorsi deep posterior axioappendicular muscles (or the intrinsic shoulder muscles) levator scapulae rhomboid minor rhomboid major