B. Aesthetics of the nose — nasal subunits and nasal Segments.

http://en.wikipedia.org/wiki/Anatomy_of_the_human_nose

To plan, map, and execute the surgical correction of a nasal defect or deformity, the structure of the external nose is divided into nine (9) aesthetic nasal subunits, and six (6) aesthetic nasal segments, which provide the plastic surgeon with the measures for determining the size, extent, and topographic locale of the nasal defect or deformity.