Alice Hamilton 



419 



There is, so far as I can find, no case of heterotopia exactly cor- 

 responding to this in the literature. I have been able to collect ten 

 cases reported and one which has not yet been published. The usual 

 situation of these aberrant bundles is in the dorsal part of the medulla, 



Fig. 



Fig. 4. 



anterior and mesial to the substantia gelatinosa, extending from the 

 lower end of the pyramidal decussation for a varying distance. Pick 

 described a tract in this region and it has accordingly since then been 

 termed Pick's bundle, although Henle had already described it but had 

 failed to interpret it correctly. Pick traced it from the decussation to 

 the level of the upper third of olives where it entered the corpus resti- 

 forme. He thought it identical with Henle's bundle, that is, one or two 

 cylindrical cords with a diameter of 25 to 50 mm. situated in the 

 posterior boundary of the reticular substance on one side, anterior to 

 the head of the posterior horn. This bundle Henle had later on come 

 to regard as the respiratory fasciculus and it remained for Pick to give 

 the true interpretation and show that it was an anomalous tract run- 

 ning, according to his view, from the lateral columns to the corpus 

 restiforme. Cramer's bundle also appeared at the level of the pyram- 

 idal decussation coming apparently from the lateral columns, the 

 fibres radiating in the direction of the corpus restiforme; but their 

 exact termination could not be made out. Cramer thought it probably 

 identical with Pick's bundle. Schaffer's bundle, appearing at the upper 

 end of the decussation, lay in the angle between the nucleus cuneatus 

 and the nucleus gracilis, apparently came from the posterior, not the 

 lateral columns, and ended in the corpus restiforme. 



The anomalous tracts of Kronthal and Yan Gieson were altogether 



