230 
THOMPSON YATES LABORATORIES REPORT 
Fig. 1 
D. C. Tr. 
V. C. Tr. 
Anterior Fibres of V. C. Tr. 
Spinal cord at the fifth cervical segment. 
At the level of the IVth cervical root this appearance was much less marked (Fig. 2), and 
just below tlie decussation (Fig. 3) the area had assumed a distinct wedge shape, this feature 
being in accordance with Singer's law. 
(II) Dorsal cerebellar tract, — The course of this tract in the spinal cord is well seen in 
Fig. 2 
Spinal cord at the IVth cervical segment. 
Figs. I, 2, 3. In this situation it has the position usually described. Sections in the lower cervical 
regions show that it is closely applied to the posterior horn, spreading inwards along its outer border 
Fig. 3 
for a considerable distance. In the lower medullary region (Figs. 4 and 5) it forms, together with 
the ventral cerebellar tract, a well-defined wedge-shaped area just anterior to the substantia 
gelatinosa of the Vth nerve. 
IVth C. rt. 
/rfyV. C. Tr. and D. C.Tr. 
Ascending portion of IVth C. rt. 
Spinal cord at the lower limit of the pyramidal decussation. 
