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Another source divides this group into "internal jugular", "spinal accessory", and "transverse cervical".
References
Henderson, Jenifer L.; Larrabee, Wayne F.; Makielski, Kathleen H. (2003). Surgical anatomy of the face / Wayne F. Larrabee Jr., Kathleen H. Makielski, Jenifer L. Henderson; illustrated by Kathleen H. Makielski. Hagerstown, MD: Lippincott Williams & Wilkins. p. 109. ISBN0-7817-4150-5.