Wilder, Neur-al Tenns. 327 



Commentancs Upon Tabic VII. 



§243. Its purpose is two-fold : — {a) To indicate, accord- 

 ing" to my present information and belief, the number and con- 

 stitution of the definitive encephalic segments. {U) To illus- 

 trate the verbal correlations between the names of the segments 

 themselves (column 2), and those of (3) their major cavities, (4) 

 their membranous parietes, and (5) their vascular plexuses. 



§244. It is in some respects an amplification of the table 

 on p. 409 in W. and G., 'Z2. It differs from that in my later 

 paper ('89, a, 121) in {a) the recognition of the Rhinencephal 

 and {b) the vertical arrangement of the segments. 



§245. From Schwalbe's table ('81, 397) it differs mainly 

 in the absence of any attempt to indicate the relative " values " 

 of the several segments upon embryologic or other grounds. 



§246. In this respect it differs also from that of His ('95, 

 162). In this latter, moreover, I have not as yet succeeded in 

 recognizing consistency with (a) his other table on p. 158, {b) 

 the segmental arrangement employed in the German list of neu- 

 ral terms (80-87), {c) a discriminating use of terms, {d) due re- 

 gard for precedent, or (r) the facts of comparative anatomy as I 

 interpret them. 



§247. Conceding the high authority of Professor His as 

 to the embryology of man, I nevertheless believe it to be alto- 

 gether undesirable to infer the segmental constitution of the 

 vertebrate brain from the conditions presented during the devel- 

 opment of the human organ. Indeed, if the embryology of 

 other forms were also taken into account, the number of poten- 

 tial " neuromeres " would be unmanageably large, even if any 

 two investigators could agree at present as to how many should 

 be recognized. 



§248. While anticipating that the problems involved will 

 be eventually elucidated upon the basis of all the facts concerned, 

 I believe our present effort should be to agree upon a schcjna 

 of the vertebrate brain which, while not contravening the facts 

 of embryology, shall harmonize so nearly with the facts of com- 

 parative anatomy as to facilitate rather than obstruct an effort 



