The transverse processes
The transverse processes of these vertebrae (H in figs. 1, 2, 3), one on
each side, are much thinner than those of the thoracic vertebrae (H, I in figs.
1 and 2, ch. 16). But at the same time they are quite extended as if to perform
the function of ribs in the loins. The first and fifth lumbar vertebrae have
shorter transverse processes than the middle ones (this is shown in the first
In none of them do the
transverse processes angle visibly upward, save those of the fifth vertebra:
the bones of the groin
[os ilii] (Q and o in the first
skeleton) prevent these from being extended transversely like the others. Those
bones come closer to that vertebra than the length of the transverse processes
in the middle lumbar vertebrae.