Fig. 50-1 Surface anatomy of the neck. The sternal and clavicular heads of the sternomastoid muscles are clearly visible. On each side, the anterior triangle of the neck is bounded by the anterior border of the sternomastoid, the anterior median line of the neck, and the lower border of the mandible. (From Royce, J., Surface Anatomy, Davis, Philadelphia, 1965, courtesy of the author and publisher.) Click for high resolution image.