<Li> The gluteus medius muscle: originates on the outer surface of the ilium between the iliac crest and the posterior gluteal line above, and the anterior gluteal line below . The gluteus medius also originates from the gluteal aponeurosis that covers its outer surface . </Li> <Li> Gluteus minimus muscle originates between the anterior and inferior gluteal lines, and from the margin of the greater sciatic notch . </Li> <P> Lateral rotator group </P> <Ul> <Li> The piriformis muscle originates from the superior margin of the greater sciatic notch (as well as the sacroiliac joint capsule and the sacrotuberous ligament and part of the spine and sacrum . </Li> <Li> The superior gemellus muscle arises from the outer surface of the ischial spine </Li> <Li> The obturator internus muscle arises from the inner surface of the antero - lateral wall of the hip bone, where it surrounds the greater part of the obturator foramen, being attached to the inferior rami of the pubis and ischium, and at the side to the inner surface of the hip bone below and behind the pelvic brim, reaching from the upper part of the greater sciatic foramen above and behind to the obturator foramen below and in front . It also arises from the pelvic surface of the obturator membrane except in the posterior part, from the tendinous arch, and to a slight extent from the obturator fascia, which covers the muscle . </Li> <Li> The inferior gemellus muscle arises from the upper part of the tuberosity of the ischium, immediately below the groove for the obturator internus tendon . </Li> <Li> The obturator externus muscle arises from the margin of bone immediately around the medial side of the obturator foramen, from the rami of the pubis, and the inferior ramus of the ischium; it also arises from the medial two - thirds of the outer surface of the obturator membrane, and from the tendinous arch . </Li> </Ul>

Is the os coxae part of the axial skeleton