. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. have been investigated by Dupuytren,* and their course in some of the bones, espe- cially the flat bones, splendidly figured by 187, and 188, copied from one of Breschet's plates, a indicates these veins in the diploe of the cranium: they may be very easily exposed in the cranium by filing away the external table with a coarse file. The first two sets of arteries have no accom- panying veins, but with the last there always are veins of a corresponding size. These do not appear large enough to return a
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. have been investigated by Dupuytren,* and their course in some of the bones, espe- cially the flat bones, splendidly figured by 187, and 188, copied from one of Breschet's plates, a indicates these veins in the diploe of the cranium: they may be very easily exposed in the cranium by filing away the external table with a coarse file. The first two sets of arteries have no accom- panying veins, but with the last there always are veins of a corresponding size. These do not appear large enough to return all the blood; we therefore have others leaving the bone by foramina, which are proper to them, and through which no artery passes. They arise in the spongy tissue by numberless radicles, re- ceive branches like other veins in their course, and, after issuing from the compact tissue by a constricted opening, empty themselves into the vessels of the neighbouring soft parts. The canals through which they pass have a lining of compact substance continuous with the external surface. The veins, while in the bone, have only one coat, the internal, which adheres closely to the osseous canal, and can enjoy no change of size or form. They are, notwithstanding, furnished with valves. Nerves, doubtless, exist in bone, although we cannot demonstrate them in the osseous substance. But it is not to be supposed that a part so highly vascular would be destitute of nerves. Nerves are seen to enter with the nutritious vessels, and minute filaments pass into some bones, as the frontal. These nerves, we may be sure, ramify through every part. The sensibility of an inflamed bone indeed settles the question. Lymphatics have not been found in the inte- rior of the osseous substance; but they may be seen on the surface.} In a tissue such as that of bone it would be no easy matter to * Propositions sur quelques points d'Anatomie, de Physiologic, et d'Anatomie Pathologique. Par. 1803. t Rccherches Anat.
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