a, b, Posteromedial views of anterior left ribs. c, d, Middle left ribs. e, Posterior left rib. f, g, Middle right ribs. h, i, Axis vertebra (C2) in anterior and posterior views. j, Middle cervical (C3 or C4) vertebra in anterior view. k, Sixth cervical vertebra in anterior view. Scale bar for a–g is 5 cm; those for h–k are 1 cm.