Publisher's Synopsis
Excerpt from The Journal of Comparative Neurology, 1891, Vol. 1: A Quarterly Periodical Devoted to the Comparative Study of the Nervous System
In the black-snake the cerebellum is a leaf-like expan sion, having on the caudad surface (really the ventral or ventricular aspect) the granular substance and the white fibrous zone cephalad; but this leaf is folded ventro-caudad, so that the white layer is dorsad and uppermost and the gray matter faces toward-tne ventricle in which lies the large plexus.
In the case of the lizard we have apparently a com pletely dissimilar plan of structure. Here the gray matter is dorsal and the white ventral (plate IV, Figs. 4 and This reversal of the two layers is explained, upon a more careful examination, as the product of a complete forward and median fold of the caudad and lateral margins of the cerebellum. (compare Plate IV, Figs. 6 This is but the completion of the process indicated by the incipient retro?exion seen in the turtle. The result of this fold is the formation of an actual cavity surrounded caudad and laterad by the white (morphologically dorsal) zone of the cerebel lum. Thus the fusion of the lateral margins, or, more accurately, the union of the whole latero-caudad re?ected margins due to a general cephalo-median increase, produces the hollow organ just described.
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