20 



The Structure of the Spinal Cord of the Ostrich 



They are distinguished from the Clarke cells and cells of the lateral 

 group by having fewer processes, by their tendency to easy disintegra- 

 tion, staining less intensely and having finer granules in the cell 

 body. These cells are present throughout the whole enlargement, 

 but are more numerous in the upper part (37th to 31st segments). A 



C£NT(7AL' 



SeOm.V. 



DORS. L AT. 



Segm.XVII. 



DOPtSAl^ 



5egm. X X. 



I-ATC««L< 



DORS. L/\T.> 





^^^mi. 



Segm.XXIX. 



Segm. XXXVI. 



i,«"r£;R/M_ 



Segm.XLIV. 



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Fig. 6. Cell-groups in the grey substance of the spinal cord of the ostrich. 



few are also seen in the 13th to 16th segments, just above the cervical 

 enlargement. As can l)e seen in Fig. 6, segm. XXIX, they are scat- 

 tered over the entire area of the central group. Very often they are 

 seen on the extreme ventral or dorsal border of the grey matter. The- 

 largest number seen in any one section (20 ^u, thick) was eight. These 

 giant cells present a striking similarity to the large cells seen in the 

 lateral group of the nucleus funiculi gracilis of the human medulla. 



