The Journal of nervous and mental disease . passes throughthis ganglion. That this is true of a very large portionof the fibres coming from the cortex I was able to estab-lish by the study of fcetal human In the seventhand eighth months of pregnancy, the cerebral structure is 1 Neurol. Centralbl., 1884, No. 15. 6/6 L. E DINGER. still a very simple one ; but later on, so many differentsets of fibres acquire their medullary sheaths that the suc-cessful staining of these brains reveals a complicated net-work which it is scarcely possible to unravel. In spiteof the fact that certain resea
The Journal of nervous and mental disease . passes throughthis ganglion. That this is true of a very large portionof the fibres coming from the cortex I was able to estab-lish by the study of fcetal human In the seventhand eighth months of pregnancy, the cerebral structure is 1 Neurol. Centralbl., 1884, No. 15. 6/6 L. E DINGER. still a very simple one ; but later on, so many differentsets of fibres acquire their medullary sheaths that the suc-cessful staining of these brains reveals a complicated net-work which it is scarcely possible to unravel. In spiteof the fact that certain researches, and particularly theembryological relations of the corpus striatum, argue infavor of the view that fibres issue from the putamen andfrom the caudate nucleus, as they do from the cortex, yeton account of the difficulties above mentioned it was quiteimpossible to determine with absolute certainty whichview was the more correct one. The cerebral structure is very much simplified amongsome of the lower vertebrates. Rabl-Ruckhardt showed. Fig. i.—Brain of Emys lutaria, sagittal section considerably laterad of the median line. some years ago that osseous fishes possessed no cerebralmantle with nerve fibres, and my own researches onamphibia and reptiles have taught me that the mantle ofthese animals contains but very lew medullated nervefibres. In these various animals the main mass of thefore-brain is made up in reality only of the corpus striatumwhich has a hemispherical nucleus. In reptiles, startingfrom this nucleus rows of ganglion cells grow into thecerebral mantle. These animals are, therefore, lacking inthose very features which complicate the mammalianbrain : they are devoid of a corona radiata extending in-ward from the cerebral mantle. There is no difficulty in showing in amphibia, reptiles, THE CORPUS STRIATUM, ETC. 677 and fishes that a well-marked bundle of fibres does actuallyissue from the corpus striatum. The course of this basalfore-brain bundle could be tra
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