. Diseases of bones and joints . it linesalso the shafts of the long bones Bone tissue is not subject itself to inflammationor actively to disease, and simply reacts to diseaseor change of its contained marrow. Usually a mildirritation of the marrow causes an hypertrophy ofbone, a stronger irritation an atrophy. If the in-flammation in the marrow be very severe, it killsthe bone mechanically by shutting off its in almost all bone diseases the customof studying the bone tissue itself has prevailed, butthis tissue is really of minor importance, like thewalls of a factory in
. Diseases of bones and joints . it linesalso the shafts of the long bones Bone tissue is not subject itself to inflammationor actively to disease, and simply reacts to diseaseor change of its contained marrow. Usually a mildirritation of the marrow causes an hypertrophy ofbone, a stronger irritation an atrophy. If the in-flammation in the marrow be very severe, it killsthe bone mechanically by shutting off its in almost all bone diseases the customof studying the bone tissue itself has prevailed, butthis tissue is really of minor importance, like thewalls of a factory in which are carried on variousactivities, like a honey-comb, or the shell of an (1) The metacarpals, metatarsals and phalanges are classed aslong bones. DISEASES OF BONES AND JOINTS 3 oyster. The only function of bone is a mechanicalone. All bone is covered by a tissue with which it isintimately connected, that is, by the periosteum orby cartilage. An endosteum has been described aslining the canals and spaces of bone. Of course,. Fig. of lower two-thirds of femur of young adult, frontalsection. Observe the thin layer of cancellous bone internal tothe dense cortex of the shaft. anything within the bone is endosteum, but thereis no special tissue to which this name should begiven. Endosteum is simply marrow. Constant change is going on in the bone, that is,its structure is always changing, and is adapting it- Endosteum DISEASES OF BONES AND JOINTS Bone Growth self to the use to which it is put. If a part be putat complete rest, the bone atrophies, if great workis demanded, the bone hypertrophies, but bothprocesses are passive, and are brought about by theaction of the marrow and periosteum. In the longbones the bone tissue may be increased in amountin two ways, first by the ossification of cartilage,and second by productive osteitis. In the latter
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbon, booksubjectbones
