. Diseases of bones and joints . mal bone and periosteum oflower metaphysis of adult femur. A—periosteum, B—bone, C—muscle. Note bone cells—small black spots in the bone—and thecharacter of the bone near the surface. case the bone trabeculae are seen under the micro-scope to be edged by small, round marrow cells—osteoblasts. Bone tissue has been said to atrophy in either oneof two ways, first by absorption of lime salts—halisteresis—and second by a rarefying best modern authority denies the existence ofthe former process. In the latter case one sees, DISEASES OF BONES AND JOINTS u
. Diseases of bones and joints . mal bone and periosteum oflower metaphysis of adult femur. A—periosteum, B—bone, C—muscle. Note bone cells—small black spots in the bone—and thecharacter of the bone near the surface. case the bone trabeculae are seen under the micro-scope to be edged by small, round marrow cells—osteoblasts. Bone tissue has been said to atrophy in either oneof two ways, first by absorption of lime salts—halisteresis—and second by a rarefying best modern authority denies the existence ofthe former process. In the latter case one sees, DISEASES OF BONES AND JOINTS under the microscope, giant cells—megaloblasts orosteoclasts—lying in depressions in the bone trabe-culae—Howships lacunae—and eating the bonetrabeculae away. When the bone has been killedby interference with its nutrition, these depressionscan often be seen in the dead pieces, but the giantcells are no longer in them. Sometimes on one sideof a trabecula, osteoclasts are devouring the bone, BoneRarefaction. Fig. 3. Photomicrograph of section from a case of acute suppurativearthritis of knee. T—bone trabeculae, along whose margins isa row of osteoblasts, showing proliferative osteitis. C—colony ofpus cocci in a blood vessel. Zeiss apochromatic 16 , ocular 4. Tube length 49 cm. and on the other side osteoblasts are laying downnew bone. Rarefaction probably may take place,however, without the presence of osteoclasts. Deadbone is easily recognized by the absence of bonecells. Macroscopically dead bone is recognized byits roughness, its change of color, and by the factthat it does not bleed when divided. DISEASES OF BONES AND JOINTS The Marrow MARROW. Normal marrow is of two kinds, the red or lym-phoid, and the yellow or fatty. The former is tobe regarded as typical marrow. It consists of areticulum of connective tissue, in whose meshes lielarge numbers of most diverse cells. The deriva-tion, function and destination of the cells are still
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbon, booksubjectbones
