At birth, the cervical spine measures 3.7 cm in length and grows to its adult state by adding a further 9 cm. It almost doubles in length by the age of 6 and gains an additional 3.5 cm during the growth spurt at puberty to reach its adult length of 12–13 cm. There are a number of important lines and landmarks used in measuring the cervical spine at both the paediatric and adult stages of development. Due to different anatomical and pathological significance, these cervical spine parameters are best presented by separating the craniocervical junction from the subaxial portion.
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