Wilder, Neural Terms. 247 



Chiasma opticum (§109) ; Nucleus dentatus (§123) ; Dura?««/^r 

 (§116); Falx cerebri {^\ 2 Af)\ Medulla oblongata (§1 16) ; Pia 

 mater (§117); Corpus striatum (§115); Tentorium cerebelli 

 (§125). ' 



§104. With the remaining six terms the differences are 

 more or less radical (§§119-122, 127-133). 



§105. CALCAR versus calcar avis. Thirty years ago, 

 in connection with the controversy as to the cerebral .peculiari- 

 ties of man, the term hippocat)ipus minor became familiar even 

 to general readers. Nevertheless, probably influenced in some 

 degree by Huxley's proposition to replace Owen's postliippo- 

 campal 2ind Henle's occipitalis horizontalis by calcarina,^ anatom- 

 ists have been more and more generally employing calcar avis, 

 and this is adopted by the German committee in preference also 

 to unguis and eminentia digitalis. The advantages of correlated 

 names (§32) for collocated parts are many and great, as illus- 

 trated by Jiippocampus \inajor\ and fissura hippocampi; by eini- 

 nentia collateralis and fissura collateralis. In the present case 

 these advantages would have been gained equally had Huxley 

 adopted Owen's posthippocavipal for the fissure and proposed 

 posthippocampus for the ental ridge corresponding thereto. In- 

 deed this would have been in accordance with the general prin- 

 ciple of locative names (§29) and learners would have been 

 spared thereby some effort of memory. In this, however, as 

 in so many other instances it is now idle to speculate upon the 

 consequences of harmonious cooperation between the two lead- 

 ers of English anatomy at that period. Assuming that calcar 

 avis has general and decided preference over the other names 

 enumerated, there need be stated here only the grounds upon 

 which calcar has been unanimously adopted by four American 

 Committees and by the three associations which they represent. 



§106. Briefly, the adoption o{ calcar is a logical corollary 

 of the recommendation which is common to the reports of all 



'Pye-Smith wrote as follows nearly twenty years ago ('77): "Of all the syn- 

 onyms of hippocampus minor, calcar avis is the most distinctive and brings it at 

 once into relation with the calcarine fissure." 



