however , the greater thickness of the anterior part of the disc , as compared with the posterior region , and the distinctive arrangement of lamellae in the posterior part of the disc , can not be attributed , as conventionally claimed from studies of the human spine , to a secondary curvature in the lumbar spine associated with an upright posture : for these features are present in the lumbar spine of the quadrupedal rabbit with its primary curvature .
C0037949
spine
C0024091
lumbar spine