VI. A contribution to the study of I., some of the decussating tracts of the mid- and inter-brain, and II., of the pyramidal system in the mesencephalon and bulb

Abstract The material which furnished the subject of this research was obtained from cats in which one hemisphere had been removed, or in which a hemisection had been made in the mesencephalon through the superior corpus quadrigeminum and the third nerve. In a preceding paper I have already detailed the descending paths of degeneration, as shown by the Marchi method. In the present instance the same method is used to demonstrate certain short tract degenerations in the thalamencephalon and mesencephalon as well as the medullated fibres which leave the degenerate pyramidal system both in these regions and in the bulb.