. Anatomy, descriptive and applied. Anatomy. CHEMICAL COMPOSITION OF BONE 41 structure, and entering the medullary cavity, sends branches toward the extremities, thus forming capillary plexuses in the marrow. These branches communicate with branches from the periosteal vessels The walls of the \essels are ^erv thin, the venous blood enters the spaces of the led marrow and the current becomes extremely slow. Small \eins collect the venous blood and emii^c tiom the bone. _. _ „iuuii lluiifeitudmal seLtioii thiouth tliL diapln Is ut tliL hu with pigment which la here black Ha\ ersian canalb aie c
. Anatomy, descriptive and applied. Anatomy. CHEMICAL COMPOSITION OF BONE 41 structure, and entering the medullary cavity, sends branches toward the extremities, thus forming capillary plexuses in the marrow. These branches communicate with branches from the periosteal vessels The walls of the \essels are ^erv thin, the venous blood enters the spaces of the led marrow and the current becomes extremely slow. Small \eins collect the venous blood and emii^c tiom the bone. _. _ „iuuii lluiifeitudmal seLtioii thiouth tliL diapln Is ut tliL hu with pigment which la here black Ha\ ersian canalb aie cut longitudin\Uj \11 ctnals are filled 90 (tozymonowicz ) Veins emerge from the long bones in three places: (1) One or two large veins accompany the nutrient artery. (2) Numerous veins emerge at the articular extremities. (3) Many small veins arise in and emerge from compact substance. The latter two classes do not accompany arteries. The veins in the marrow and in the bone are devoid of valves; but immediately after emerging from the bone they have numerous valves. In the flat cranial bones the veins are numerous and large. The lymphatics are chiefly periosteal; but some have been demonstrated as entering the bone, nlong with the vessels, and running in the Haversian canals. Nerves, meduUated {myelinic) and nonmeduUated (amyelinic), are found in bone. They are distributed freely to the periosteum, and some of the fibres terminate in this structure as Pacinian corpuscles. Nerves accompany the nutrient arteries into the interior of the bone, and also reach the marrow from the periosteum by w^ay of Volkmann's canals and the Haversian canals. They certainly supply the arterial coats and possibly ramify about the osteoblasts. Nerves are most numerous in the articular extremities of the long bones, in the vertebrae, and the large flat bones. Chemical Composition of Bone.—Bone consists of about 36 per cent, of animal {organic) and about 64 per cent, of earthy {inorganic) substanc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
