. Human physiology : designed for colleges and the higher classes in schools, and for general reading. that when any two of these were much bent spinal columnupon each other, there would be pressure upon in Bw* the spinal cord ; and pressure would produce palsy, and oftendestroy life. But with the simple arrangement above described,free motion, almost to a right-angle in some directions, can boexecuted without pressing on the cord. And besides this, youcan see that the cord by this arrangement will not be bent atan angle, as the vertebrae are, but in a curve, for the spaces inthe spinal canal
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. that when any two of these were much bent spinal columnupon each other, there would be pressure upon in Bw* the spinal cord ; and pressure would produce palsy, and oftendestroy life. But with the simple arrangement above described,free motion, almost to a right-angle in some directions, can boexecuted without pressing on the cord. And besides this, youcan see that the cord by this arrangement will not be bent atan angle, as the vertebrae are, but in a curve, for the spaces inthe spinal canal at the joinings allow of a lateral movement ofthe spinal marrow at these points. 289. It would be interesting to consider in full the variationsin the spinal column in different classes of animals. But I willonly allude to a few of them. In quadrupeds, as they havetheir heads suspended, instead of being supported, as in man,upon a column of bones, the spinous processes in the neck arevery large, and project much, for the attachment of strongmuscles which hold up the head and move it. There is also. THE BONES. 189 Spinal column in fishes, reptile*, and in neck of giraffe. FIG. 99.
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