Results 1 The deep cervical fascia could be divided into four layers. The deep layer of the deep cervical fascia is subdivided into alar fascia and prevertebral fascia. The carotid sheath consists of all the layers of the deep cervical fascia.

• 结果 1.；颈深筋膜应分为四层；颈深筋膜深层分为翼筋膜和椎前筋膜；颈深筋膜各层均参与颈动脉鞘的形成。