Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 614 PHYSIOLOGY It will be convenient to trace first the modifications under- gone by the axial part of the nervous system in the brain, and then to deal with the new masses of grey matter which have no homologies in the spinal cord, as well as the long tracts of white matter serving to connect different levels or different sides of the brain. In examining successive sections from the spinal cord up through the medulla, the first change which makes its appearance is due to the decussation of the
Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 614 PHYSIOLOGY It will be convenient to trace first the modifications under- gone by the axial part of the nervous system in the brain, and then to deal with the new masses of grey matter which have no homologies in the spinal cord, as well as the long tracts of white matter serving to connect different levels or different sides of the brain. In examining successive sections from the spinal cord up through the medulla, the first change which makes its appearance is due to the decussation of the pyramids Bection IIuoukIi the lower bolder of the nieduUii oblongata, at the pyramidal decussation (Bechterew). anterior fissure ; cl, decussation of the pyramids; V, anterior columns ; , anterior cornu ; cc, central canal; S, lateral columns; , formatio reticularis; cc, neck, and g, head of the posterior cornu; , posterior root of first cervical nerve; , beginning of nucleus cuneatus; , nucleus gracilis; H\ funiculus gracilis; H'-, funiculus cuneatus; , posterior fissure. (Fig. 280). Throughout the spinal cord, fibres have been crossing from one side to the other through the anterior white commissure, many of them belonging to the pyramidal system. But at the lower border of the medulla we see a large mass of fibres crossing between the anterior columns and the postero-lateral columns, at first cutting off the head of the anterior horn and later on breaking this up altogether, so that the only definite collection of grey matter left in this situation is a small part of the lateral column of grey matter
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