[Anatomical observation and experimental studies on changes in structure and volume of intravertebral canal during backward extension of neck]

Abstract

The authors dissected cervical vertebral specimens from 10 cadavers. Changes in structures of intravertebral canal were observed during extension-flexion movement. By pouring wax into vertebral canal, changes of the sagittal diameter and the cross-section area were measured during backward extension of the neck. It was found that the morphology and position of fibrous annuli, subflavous ligaments, the spinal canal and the dura mater were all changed. These changes can affect the volume of the vertebral canal, and can press the spinal cord when they are severe.