Practical pathology; a manual for students and practitioners . downwardsâalongthose tracts marked with an arrow pointing downwards. If there beinjury to the cord at any definite level,âan injury which may betraumatic or due to hemorrhage or the growth of a tumour,âasecondary degeneration may be found passing from it upwards in thecolumns marked with an ascending arrow, and downwards in thosemarked with the descending arrow. Descending tracts.âThe most important of these is the crossedpyramidal tract, which, coming from the brain, crosses in the medullaoblongata at the decussation of the pyrami
Practical pathology; a manual for students and practitioners . downwardsâalongthose tracts marked with an arrow pointing downwards. If there beinjury to the cord at any definite level,âan injury which may betraumatic or due to hemorrhage or the growth of a tumour,âasecondary degeneration may be found passing from it upwards in thecolumns marked with an ascending arrow, and downwards in thosemarked with the descending arrow. Descending tracts.âThe most important of these is the crossedpyramidal tract, which, coming from the brain, crosses in the medullaoblongata at the decussation of the pyramids, and runs along the wholelength of the cord in the position marked The direct pyramidaltract {) comes down from the brain through the medulla, butdoes not cross over to the op[)Osite side; it forms a small strip whichbounds the anterior median fissure and is found in the u[)per halfof the cord only. Between these two pyramidal tracts, forming aconnecting link, is a crescentic strip midway between the surface and 624 NERVOUS SYSTEM fJc. Fig. 203.âDiagram to illustrate the general arrangement of theseveral tracts of white matter, and of the multipolar cells in the greymatter in the spinal cord. Made up from a series of diagrams pre-pared by Dr. Sherrington, and given in Fosters Physiology. Crossed pyramidal tract. Direct pyramidal Antero-lateral descending Descending comma -shaped tract. Direct cerebellar ;/. Postero-median column, made up of sacral, lumbar, and dorsalroot fibres, ; and cervical root fibres, c.} Ascending lateral, or Gowers Postero-external Lissauers zone. a. Anterior horn of grey Multipolar ganglion cells of anterior II. r. Anterior nerve root. /. Posterior horn of grey matter, in v\hich are a few nerve ;osL ) Posterior nerve root. Lateral horn of grey Cells of the anterior cervix. Clarkes column (
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