328 



S. Simpson, 



substantia gelatinosa of Rolando. They may belong- to the spinal 

 motor decussation, being destined for the lateral columns of the spinal 

 cord; that is to say, the pyramidal decussation may not be confined 

 to the lower part of the medulla oblongata, but may occur to a li- 

 mited extent in the upper part as well, beginning even in the lower 

 part of the pons. In some of the cats, and in one of the monkeys a 

 few transversely cut fibres could be made out in the formatio reticu- 

 laris anterior and internal to the substantia gelatinosa of Rolando in 



Median raphe 



Fibres passing to facial 

 Nucleus of savie side 



Fig. 3. 



Fibres represcntt'd as pas- 

 sing to facial Nucleus of 

 opposite side 



Photograph of drawing from Romanow's paper representing fibres passing from the 

 degenerated pyramid to the facial nucleus of the opposite and of tlie same side. 



the bulb on the side opposite to the lesion (fig. 11). These may re- 

 present fibres which have decussated at a higher level and are now 

 passing down to join the main mass of heterolateral fibres in the 

 lower part of the bulb. This would explain the significance of Pick's 

 bundle, a -fasciculus of fibres first described by Pick [22] in 1889, as 

 ascending from the lateral column of the cord and ending in or near 

 the nuclei of the posterior columns. Hoche [20] in 1898 described it 

 as a descending tract partly of pyramidal origin and (|uite recently 

 (1901) Barnes [2J] has investigated it. He describes it in one case 

 as follows: — "In the lower sections of the medulla are seen degene- 

 rated four small bundles of fibres closely massed togetliei- at the inner 



