. Human physiology : designed for colleges and the higher classes in schools, and for general reading. SECTION OF BONK. THE BONES. 17S No sensibility in bones. Variety of shape. tubes pass out from the canals to the rows of cavities whichare around the canals, and thus a circulation is kept up atevery point of the solid bone. It is supposed that the blooditself does not circulate in these little channels and cavitiesin the solid bone, but a fluid containing the constituents ofbone. For these channels are too small even to admit thecells which the microscope shows us as swimming in the
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. SECTION OF BONK. THE BONES. 17S No sensibility in bones. Variety of shape. tubes pass out from the canals to the rows of cavities whichare around the canals, and thus a circulation is kept up atevery point of the solid bone. It is supposed that the blooditself does not circulate in these little channels and cavitiesin the solid bone, but a fluid containing the constituents ofbone. For these channels are too small even to admit thecells which the microscope shows us as swimming in the fluid that circulates in them is selected from the blood,which is contained in the bloodvessels in the cavity of thebone, and in the periosteum that envelopes it. 271. It is a very common popular notion, that the bones areendowed with great sensibility, and especially the central part,the marrow. The surgeon is very often asked if the sawing ofthe bone in amputation is not very painful, and if when the sawreaches the marrow it does not produce agony. But thetones have in their healthy state no p
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