Wilder, Neural Tcnns. 221 



cavity of the cerebrum or a feature of the myel (spinal cord). 

 V>\\t postcomu, as introduced by me in 1881, applies only to the 

 cerebral cavity and is thus an idionym. 



§26. Contextual Explicit/less. — For want of a better phrase 

 this may refer to the possibility of employing terms that might 

 be ambiguous but for their association with others. A com- 

 mon example is cord, which may be used in at least five senses, 

 by the neurologist, the laryngologist, the surgeon, the obste- 

 trician and the embryologist. When an entire publication or 

 section of it refers to a group of organs of the same general 

 character, then the generic element of their polyonymic desig- 

 nations may be often omitted and the specific alone employed ; 

 e. g., with arteries, fissures, gyres, etc. Indeed, to be abso- 

 lutely explicit or idionymic in all cases would require many 

 new names or the addition of genitives or other qualifiers to 

 many already existing. 



§27. Locative Names. — The location of a part is a general 

 and comprehensive attribute and, as remarked by Owen, " sig- 

 nifies its totality without calling prominently to mind any one 

 particular quality, which is thereby apt to be deemed, undeser- 

 vedly, more essential than the rest." 



§28. Prepositional Locatives. — With these the qualifying 

 prefix, a preposition or adverb, indicates the location of a part 

 relatively to some other part, more important, more easily rec- 

 ognized, or earlier designated. Praecunens designates a cortical 

 area just "in front of" the cuneus. 



§29. Adjectival Locatives. — These indicate either the lo- 

 cation of a part within some general region, or its membership 

 of a series. Vertebra tJwracalis designates a spinal segment in 

 the thorax. Cojjunissura anterior, cm. media, and cm. posterior 

 distinguish members of a conventional series. Mesencephalon, 

 prosencepJiakvi and nietencephalon designate members of a natural 

 series, and the prepositions have the force of adjectives ; see 

 §§173-192. 



§30. Base {I'eilmm basalc). — The original or more essen- 

 tial element of a derivative, as distinguished from prefixes, suf- 

 fixes, inflective terminations, etc. 



