51() 



A. J. LINOWIECKI 









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\ir 







f^^ ^ 





-■^^i^; 







-.>-, 



fi. 



.fc 



cp 



' v'r ' ■ : ■ ;"-&■! pf- 



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— cc. 



Fig. 1 From the seventh cervical segment of the spinal cord of the albino 

 rat. Pyridine-silver. X 93. The fasciculus gracilis stains somewhat darker 

 than the fasciculus cuneatus because it contains chiefly medium-sized fibers, 

 while the fasciculus cuneatus contains many very large ones. Large medullated 

 axons stain light yellow and their myelin sheaths are colorless, hence those 

 regions in which they jjredominate stain lightly by the pyridine-silver method. 

 The fasciculus cerebro-spinalis or pyramidal tract is located in the ventral part of 

 the posterior funiculus and is very deeply stained because it is composed of deeply 

 staining non-medullated and fine medullated fibers closely packed together. 

 Nerve cells stain deeply and are indicated in the drawing in solid black. 



ABBREVIATIONS 



L.t., Lissauer's tract 

 J.C., fasciculus cuneatus 

 J.g., fasciculus gracilis 

 e.r.z., entering root zone 

 f.c.s., fasciculus cerebello-spinalis 

 p.t., fasciculus cerebro-spinalis — pyra- 

 midal tract 

 cp., columna posterior 



CM., columna anterior 



c.a.d., commissura anterior alba 



J.m.a., fissura mediana anterior 



C.C., canalis centralis 



d.f., decussating fibers of pyramidal 



tract 

 s.g.R,. substantia gelatinosa Rolanid 

 r.p., radix posterior 



