Conclusion: The superficial layer of prevertebral fascia is the main portion of the carotid sheath, which should avoid overtraction in the anterior cervical approach.

• 结论：椎前筋膜是颈动脉鞘的主要组成部分，使颈动脉鞘相对固定，在颈椎前路手术中应避免用力牵拉。