Diagram of a child's nasal passages, sinuses, and throat

This drawing of the internal anatomy of a child's nasal passages, sinuses, and throat, was for "Darwinian Dentistry Part 2: Early Childhood Nutrition, Dentofacial Development and Chronic Disease," by Kevin L. Boyd, M.Sc., DDS, Journal of the American Orthodontic Society, March/April 2012.

The technique is graphite pencil on paper.