Regular anatomical terms revisited: The simplest is often the right one.

Regular anatomical (RA) terminology rules were developed to simplify and clarify Latin anatomical terms in a systematic manner. These rules, which prohibit conjunctions, prepositions, and appositions, and define a consistent word order pattern, are extensions of the original 1895 rule of anatomical nomenclature that anatomical terms should be as short and simple as possible. It is not coincidental that most terms in Terminologia Anatomica (TA), and many traditional terms that were not used in TA, are consistent with RA term rules, and that the RA term rules are also consistent with the guidelines for expanding short form terms to full, unique terms. The consistent form of RA terms facilitates learning and translation, and is easier for humans and machines to manipulate than terms that are not compliant with RA term rules. Despite assertions to the contrary, RA terms are proper Latin terms that simplify the anatomical terminology and, in many cases, restore traditional terms.