Radical neck dissection method systematized by Crile (1906) and establish and popularized by Martin et al. in ORL or oral surgery field. Radical neck dissction is most important treatment for head and neck cancer. But in fact, the method dissection modified by each cases such as the metastasis stage. For this reason, the anatomical knowledge especially head and neck region are very important to avoid the medical accident for QOL. In this time, the anatomical knowledge described again for neck region.