30 



THE SPINAL CORD. 



along the whole length of the cord, being gradually shifted inward towards the postero- 

 mesial column, and forming as they reach this column the tract of (roll, which becomes the 

 funiculus gracilis in the medulla oblongata ; from the tract of Goll the fibres eventually 

 pass, some into the grey matter of the upper part of the spinal cord, others into grey matter 

 in the nucleus gracilis of the bulb, whilst yet others derived from the uppermost 

 cervical roots do not reach the tract of Goll but pass up to the bulb in the funiculus cuneatus 

 and end in its nucleus. (4.) The remainder of the fibres which have entered by the 



corp. quoudr. cmt. 



meci. obi. 



Fig. 24. DEGENERATIONS IN THE MESENCEPHALON, PONS VAROLII, MEDULLA OBLONGATA, AND SPINAL 



CORD OF A MONKEY, FOLLOWING A LESION OF THE ASCENDING FRONTAL CONVOLUTION. (E.A.S.). 



The lesion was on the right side of the brain. The section outlines are drawn to one scale. The 

 degenerated fibres are shown by black dots. 



The degeneration is mainly on the same side in the mesencephalon, pons, and bulb, but on the 

 opposite side in the spinal cord. A few fibres are degenerated in the antero-lateral region in the oord, 

 but the degeneration is otherwise confined to the pyramidal tracts. 



