282 



At the suggestion of Professor Stöhr in Würzburg, Herr Ziegler 

 (Atelier für wissenschaftliche Plastik) in Freiburg i. B., has under- 

 taken to reproduce the model ^) in order that it may be put into 

 the hands of those especially interested in the study of the nervous 

 system. 



Whereas the original model included only one side of the 

 region, the reproduction consists of four separate models each of 

 which shows both sides. This is necessary in order that the different 

 fibre bundles can be traced through their decussations. Owing to the 

 complexity of the model it seemed wiser for me to go to Freiburg 

 and personally direct the work; and indeed it has taken the entire 

 cum mer to be sure not only that all of the details of the original 

 model are accurately reproduced but also that the course of each path 

 has been made clear for the student. As has been said the model as 

 made by Herr Ziegler consists of four separate models. The first is 

 a series of sections swung in a frame, to be used to relate the other 

 models to transverse sections. The other three models represent the 

 internal structures in plastic form. Each one is swung in a frame, 

 which can be revolved to any degree (Fig. 1). Thus the models can 

 be viewed from every aspect and each structure is brought to view 

 without taking any thing apart. This seemed the wiser plan for in 

 the first place it prevents the confusion the student would find in 

 putting together so complex a structure and in the second place it 

 avoids the breakage involved in frequent handling. 



The models have been colored as in the original plates. All of the 

 nuclei are in solid colors while the fibres are marked by lines upon a 

 white back ground. In general, red is used as the color for motor structures 

 and blue for sensory. The nuclei of the motor cerebral nerves as well as 

 the ventral horns of the cord are in red and the motor root fibres are 

 marked with red lines. On the other hand the nuclei of reception of 

 the sensory cerebral nerves together with the dorsal horns of the cord 

 and the nuclei of the dorsal columns, nuclei funiculi gracilis et cuneati 

 are in blue. The sensory cerebral nerves are also marked with blue 

 lines. All other fibres are marked with black lines and all other nuclei 

 are in yellon. 



Doctorate and in Vol. IX of the Johns Hopkins Hospital Reports. 

 Later it was republished as an Atlas by Friedenwald and Company of 

 Baltimore. 



1) A special circular in regard to the model can be procured from 

 Herr Zieglee's Atelier in Freiburg i. B. 



