The =spinal cord= is almost circular in cross-section except at the
well-marked cervical and lumbar enlargements, where it is compressed
dorso-ventrally. The conus medullaris lies over the junction of the
sixth and seventh lumbar vertebræ. The length of the cord of a rather
large dog was found to be about 38 cm.; of this, the cervical part was
11 cm., the thoracic 17.4 cm., the lumbar about 7 cm., and the
sacro-coccygeal about 2.6 cm. (Flatau-Jacobson).
[Illustration: