HE brain stem and spinal cord, from a mechanical point of view, can be regarded as a single unit, securely fastened above and below. During movement, the cervical cord and its dural covering slide upwards and downwards no more than s or 3 mm. within the vertebral canal. Therefore, the cord adopts the length of the spinal canal. When the cervical spinal column is flexed (ventroflexed), the cervical spinal canal elongates and the cord is stretched and lengthened. Extension (dorsiflexion) of the cervical spinal column causes the cord to relax and shorten. Smith 2~

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