A few subjects will be encountered on whom no cervical spine prominence is detectable. On such subjects, estimate the point as nearly as possible with respect to the neck and shoulders. A few subjects will exhibit two or three equally prominent spinal processes. In such cases, mark the spine that is closest to the posterior base of the neck as established by a tape. Be sure that the head is in the Frankfort plane when the landmark is drawn.
Subject is in the anthropometric standing position.
Place dots over the landmarks. Subject is in the anthropometric standing position. Stand in front of the subject and locate, by inspection, the most protruding point of the right upper arm overlying the deltoid muscle. Draw a short horizontal mark through the landmark. Use a landmark transfer rod set at the height of the right deltoid landmark to establish the location of the left deltoid landmark.