It will harm the internal jugular vein if we cut the nerve over this muscle is cut . The diameter of the accessory nerve under sternocleidomastoid muscle is (2.3 0.5)mm. 在胸锁乳突肌深面的副神经最大横径为（2.
Accessory nerve external portion 副神经外部
The position in the deep surface of the digastric muscle is the hightest position for cuting the accessory nerve. 二腹肌后腹深面为高位结扎切断副神经点，若再向上易伤颈内静脉。
To introduce the designed dorsal-approach spinal accessory nerve transfer for the repair of suprascapular nerve to restore the shoulder abduction. 介绍后入路副神经移位修复肩胛上神经、治疗臂丛神经损伤、恢复肩关节外展功能的新术式,并探讨其临床疗效。
Methods: Microdissection were used to obtain the number, origins and anastomosis sites of the ramus communicans as well as the related data of the spinal accessory nerve. 方法：利用显微解剖方法，观测交通支的数量、来源、交通部位及副神经相关数据。