The diseases of infants and children . Fig. 196.—Anatomical Specimen of Rachitic the rachitic rosary produced by enlargement at the costo-chondral articulations. cartilage, is hyperemic and the cartilage cells more numerous than nor-mal and irregularly arranged. The columnar zone next to it is still moreaffected in the same way, being abnormally wide and exhibiting anunusual length of columns of cells and increase of vascularity. This. Fig. 197.—Rachitic Chest Viewed fkom the case as in Fig. 196. is not due to an abnormal production of cartilage but to a failure of itto
The diseases of infants and children . Fig. 196.—Anatomical Specimen of Rachitic the rachitic rosary produced by enlargement at the costo-chondral articulations. cartilage, is hyperemic and the cartilage cells more numerous than nor-mal and irregularly arranged. The columnar zone next to it is still moreaffected in the same way, being abnormally wide and exhibiting anunusual length of columns of cells and increase of vascularity. This. Fig. 197.—Rachitic Chest Viewed fkom the case as in Fig. 196. is not due to an abnormal production of cartilage but to a failure of itto be transformed into bone in the normal manner (Schmorl). ^ The layersof cartilage are transversed irregularly by canals containing much-dilatedblood-vessels and soft, vascular, imperfectly formed osteoid tissue,deficient in lime-salts. The zones of calcification and, last, of ossification, 1 Loc. cit, 424. RACHITIS 589 are broader than in healthy bone and have lost their normal, sharply-defined outlines, exhibiting instead calcified areas irregularly mingledwith others still cartilaginous, and with scattered, unusually largemedullary spaces containing osteoid tissue. This disappearance of thesharply-defined junctions of the zones, as seen in the normal epiphysis,with the irregular inroads of one into the other, is one of the most strikingcharacteristics of rickets. The spongy portion of the shaft exhibitsincreased vascularity, with eros
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Keywords: ., bookcentury1900, bookdecade1910, booksubject, booksubjectchildren
