. The nervous system: an elementary handbook of the anatomy and physiology of the nervous system for the use of students of psychology and neurology . 1. Anterior median tissiue. 2. Posterior medianfissure. 3. Anterior iiom (in red), with. 3, anteriorroot, 4. Posterior horn (in blue), with 4, posteriorroots, 5, Crossed pyramidal tract, 6. Posteriorcolumn. The red arrows, a, a, indicate the coursethe crossed pyramidal tract takes at the level of thedecussation of the pyramids; the blue arrows, 6, &,indicate the course which the sensory fibres 1. Anterior median, fissure. 3. Posterior med
. The nervous system: an elementary handbook of the anatomy and physiology of the nervous system for the use of students of psychology and neurology . 1. Anterior median tissiue. 2. Posterior medianfissure. 3. Anterior iiom (in red), with. 3, anteriorroot, 4. Posterior horn (in blue), with 4, posteriorroots, 5, Crossed pyramidal tract, 6. Posteriorcolumn. The red arrows, a, a, indicate the coursethe crossed pyramidal tract takes at the level of thedecussation of the pyramids; the blue arrows, 6, &,indicate the course which the sensory fibres 1. Anterior median, fissure. 3. Posterior medianfissure. 3. Motor roote. 4. Sensory roots. 5. Easeof the anterior horn, from which the head (5) hasbeen detached by the crossed pjTramidal tract, 6, Decussation of the crossed pyramidal tracts. 7. Posterior horns (in blue). 8. Gracile nucleus. (1) To facilitate the understanding of this region it is convenient to tracethe pjrramidal tracts upwards from the spinal cord, although it must be bornein mind that the impulses which they convey travel downwards. Just beyond the spinal cord, at the region of the pyramidal or motor decussa-tion, the crossed p3rramidal tracts run forwards and inwards and cross theanterior median fissure to join the direct pyramidal tracts of the opposite their passage they cut through the anterior horns of grey matter, separatingoff completely the apices of these, but leaving the basal portions in the floorof the central canal (Figs. 45 and 46). The apex of the horn, thus pushed aside,forms a nucleus terme
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Keywords: ., bookcentury1900, bookdeca, booksubjectnervoussystem, bookyear1912
