AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, JULY 24 
THE FUNDAMENTAL PLAN OF THE VERTEBRATE 
BRAIN 
B. F. KINGSBURY 
Department of Histology and Embryology, Cornell University, Ithaca, New York 
THIRTY-THREE FIGURES 
CONTENTS 
lisn(sneys hero ein as ween eey ees een ia ecto Onis mic toe tans wpmincic “roma aurea. 461 
COD] OYS CET RATAzH KONA eee earn aaa ei ie aie as AP cuentas Gree ELA aacenicee Paci ae eacsies PR tose ic liercact 467 
1. The extent of the brain plate and the primitive optic furrow.......... 467 
B Maw suitvien, emamingyligy (GyaeSiMONe)) 2 a oonoucaosuscuesnas coe. sons cedconS 473 
Ss 'The sutura neurochordalis (ventralis) 4... 2. ..s--.<+-sseeee-+-5- 404 
GON CHUSION SMe eee oe ete ane eae o PS ee ers athe: c Obs uae nibs, Ae al ner apetersea rene 480 
Epis liocancap linyas creme ete erin ry eta oe LE. cree Se hcdety ets & che eae ay cieheh etn eaten 484 
INTRODUCTORY 
In a recent paper (Kingsbury, ’20) I pointed out that many 
reasons both from fact and theory called for a fundamental 
modification of the primary morphological plan of the brain as 
given by His (’88, ’89, 792, 93) and commonly presented by 
current text-books as established. The His conception of the 
brain was that of a primitively tubular structure (cf. His, ’88, 
fig. 12). With the development by His of the very useful and 
fundamental idea of the existence of paired primary motor and 
sensory zones medially united by lines of suture, and the incor- 
poration of this with the earlier interpretation of the brain as a 
tube, the logical conclusion was that these zones extended 
throughout the tube and that the ventral and dorsal sutures of 
the neural tube, marked by floor plate and roof plate, were at 
the anterior end of the tube supplemented by a third, terminal, 
suture (frontale Endnaht). In the discussion that follows these 
postulated or demonstrated lines of closure will be referred to as 
sutura neurochordalis (ventralis), sutura dorsalis, and sutura 
terminalis (anterior), respectively. 
461 
