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AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, JUNE 27 
THE VASCULARITY OF THE CEREBRAL CORTEX OF 
THE ALBINO RAT 
EDWARD HORNE CRAIGIE 
Department of Biology, University of Toronto 
FIVE FIGURES 
The work upon which the present paper is based is an exten- 
sion of that previously reported by the writer (’20). In the 
former publication an account was given of the relative vascular- 
ity of various parts of the spinal cord, brain stem, and cerebellum 
of the albino rat, and this account is extended in the present 
communication to include the cerebral cortex of the same ani- 
mal. In such a connection, there comes up for consideration 
not only the richness of the capillary supply of the cerebral 
cortex as compared with that of the parts previously studied, 
but also the relative vascularity of the various regions into which 
the cortex has been divided by physiologists and histologists. 
Also, little, if at all, behind these problems in interest comes the 
question of the conditions in the various layers which character- 
ize the cortex. 
The more important accounts of the cortical localization in 
rodents, in so far as they are based upon histological studies, 
are reviewed by Sugita in his paper (717) on the growth in thick- 
ness of the cortex. He also correlates the various regions in 
which his measurements were made with the detailed description 
by Fortuyn (’14) of the conditions in the Norway rat and with 
the anatomico-physiological terms of Brodmann (’09). 
Sugita found the cortex of the albino rat, as Fortuyn had 
found that of the Norway rat, to be divisible, in typical localities, 
into five laminae. His description of these laminae is as follows: 
The cerebral cortex of the albino rat has five cell layers if a typical 
locality be taken. The most external layer is the lamina zonalis 
(1), which has a few scattered glia-cells. Under this, there is the lamina 
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