颈椎椎管的矢状径的平均值，女性小于男性1mm。其中以颈 1 及颈 2 最大，约为25～30mm，颈 3 ～颈 7 为最小值。而相邻的椎骨的椎管直径相差不超过2mm。
In saggital view, the length of cervical vertebrae (from C1-C7)is 12.5cm. The thoracic part is about 28 cm., the lumbar part is about 18 cm., and the sacrum and coccyx 12.5 cm. The length of the column is about 71 cm(28in) in an average adult male, and about 61 cm (24in) in an average adult female.
Is that answered your question?
Cheers!