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Ver"tebra
(), n.; pl. Vertebr (). [L. vertebra, fr. vertere to turn, change. See Verse.]
1. (Anat.) One of the serial segments of the spinal column.
In many fishes the vertebr are simple cartilaginous disks or short cylinders, but in the higher vertebrates they are composed of many parts, and the vertebr in different portions of the same column vary very greatly. A well-developed vertebra usually consists of a more or less cylindrical and solid body, or centrum, which is surmounted dorsally by an arch, leaving an opening which forms a part of the canal containing the spinal cord. From this dorsal, or neural, arch spring various processes, or apophyses, which have received special names: a dorsal, or neural, spine, spinous process, or neurapophysis, on the middle of the arch; two anterior and two posterior articular processes, or zygapophyses; and one or two transverse processes on each side. In those vertebr which bear well-developed ribs, a tubercle near the end of the rib
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