The long white ridge of his spine, with the huge, prominent shoulder blades and jutting ribs and vertebrae, was bare, and Marya Nikolaevna and the waiter were struggling with the sleeve of the night shirt, and could not get the long, limp arm into it.
There are no more uses of "vertebrae" in the book.
Show samples from other sources
While making a tackle, the C3 and C4 vertebrae in his spinal cord were telescoped.
Naked from the waist up, his vertebrae extruded from his skinny back as he hunched over the desk, working.