The eighth pair, called cervical, pass out in the region of the neck; twelve, called dorsal, in the region of the ribs; five are lumbar, and five sacral, while the last pair leave the cord near the coccyx.

"Robert T. Edes, M.D. [40] Thus the fibers which pass out from the sacral plexus in the loins, and extend by means of the great sciatic nerve and its branches to the ends of the toes, may be more than a yard long.

The spine of the dog consists of seven vertebrae in the neck, thirteen in the back, seven in the loins, three sacral vertebrae, and twenty to twenty-two in the tail.