128 FLORENCE R. SARIN 



being entirely non-medullated. I have, however, not sufficient evi- 

 dence to determine whether this globus pallidus — cortical radia- 

 tion is ascending or descending. Flechsig regards the entire 

 radiation both to the anterior and to the posterior central con- 

 volutions as ascending. It is, I think, important here to identify 

 the medullated projection bundles shown in the models with 

 those described b}- Flechsig. In Flechsig's summary as given on 

 page 369, his a bundle, consisting of a very few fibres from 

 the globus pallidus (or possibly from the substantia nigra) to 

 the upper third of the central convolutions and distinguished by 

 early medullation, can not be separated from the rest in my 

 series. The |3 bundle from the ventro-lateral nucleus to the 

 upper third of the central convolutions is my thalamo-cortical 

 radiation (no. 26); while the /S bundle, consisting of the large 

 mass of fibres from the globus pallidus to the same zone of the 

 cortex, is the same as my no. 27. The combined thalamo-and 

 lenticular-cortical radiation in one of our series reaches only 

 the post central convolution ; in the others, it reaches the anterior 

 central as well as it does in Flechsig's series. The rest of the med- 

 ullated bundles of projection fibres described bj^ Flechsig in 

 foetuses up to 50 cm. long, and in the new-born, are not medul- 

 lated in our series. 



There is one more bundle of fibres which, though, non-medul- 

 lated, has a form relation to the internal capsule, namely, the 

 stria medullaris thalami. In figs. 3 and 4, it shows as a band 

 of fibres (no. 54), extending from the zone of the knee (no. 36) 

 of the internal capsule along the border of the thalamus adjacent 

 to the caudate nucleus. Its position with reference to the anterior 

 nucleus of the thalamus is plain in fig. 1. 



Thus, in the central nervous system in one specimen of a new- 

 born babe we have medullated bundles which may be grouped into 

 the following tracts. First, a sensory tract involving three ele- 

 ments, the dorsal columns of the cord to the nuclei of the dorsal 

 columns, the medial lemniscus from the nuclei of the dorsal 

 columns to the ventro-lateral nucleus of the thalamus, and the 

 thalamo-cortical radiation from the ventro-lateral nucleus of the 

 thalamus to the upper third of the posterior (possibly anterior as 



