334 S. Simpson, Secondary Degeneration following Unilateral Lesions etc. 



Fig. 14. T. S. Spinal cord of monkey through 6th cervical segment showing 

 crossed and direct lateral pyramidal tracts with a few fibres passing into 

 base of posterior horn on right side. 



Fig. 15. T. S. Spinal cord of monkey — 4th dorsal segment. Shows homolateral 

 and heterolateral pyramidal fibres. 



Fig. 16. T. S. Spinal cord of monkey — 4th lumbar segment. Shows a few 

 fibres from degenerated crossed pyramidal tract passing towards grey 

 matter at base of posterior horn. Homolateral fibres are still seen. 



Fig. 17. T. S. Spinal cord of monkey through 4th sacral segment. Shows cros- 

 sed and direct pyramidal tracts still present. 



