. Quain's elements of anatomy . r similar to those immediately to be mentioned in thered marrow. In short bones, and in the cancellated ends of long bones,but esj)ecially in the cranial diploe, the bodies of the vertebrae, thesternum, and the ribs, the marrow is red or reddish in colour, of more fluidconsistence, and with very few fat-cells. While, however, the fat-cells arescanty in the red-coloured maiTow, itcontains numerous roundish nucleatedcells—the proper marroiv-cells of KoUiker (fig. 98, e—i). These in generalappearance resemble the pale corpuscles of the blood, but are larger, witha
. Quain's elements of anatomy . r similar to those immediately to be mentioned in thered marrow. In short bones, and in the cancellated ends of long bones,but esj)ecially in the cranial diploe, the bodies of the vertebrae, thesternum, and the ribs, the marrow is red or reddish in colour, of more fluidconsistence, and with very few fat-cells. While, however, the fat-cells arescanty in the red-coloured maiTow, itcontains numerous roundish nucleatedcells—the proper marroiv-cells of KoUiker (fig. 98, e—i). These in generalappearance resemble the pale corpuscles of the blood, but are larger, witha clearer protoplasm and a relatively larger nucleus. Like the pale cor-puscles, they exhibit amoeboid movements. Amongst them are smallercells which present a reddish colour, and resemble in aj^pearance theprimitiTO nucleated corpuscles of the embryo (fig. 98, y—t); these are thecells which have been described as representing transitional forms betweenthe proper marrow-cells and red blood-disks (vide ante, p. 37). Fig. Fig. 98.—Cells op the red maeeo-w of the guinea-pig. Highly magnified. (E. A. S.) a, a large cell the micleus of whicli appears to be partly divifled into three by constric-tions ; h, a cell the enlarged nucleus of -which shows an appearance of being constrictedinto a number of smaller nuclei ; c, a so-called giant-cell or myeloplaxe with manynuclei; d, a smaller myeloplaxe with three nuclei ; e—i, proper cells of the marrow;i—t, various forms of coloured nucleated cells. Other cells have occasionally been noticed containing one or more redcorpuscles in their interior : whether these have been developed in situin a manner similar to that previously described in connective tissuecorpuscles of the young animal, or have been taken into the interior ofan amoeboid cell, there to be transformed into pigment granules, is notcertainly known. Cells containing reddish pigment gianules are, how-ever, not uncommon. There further occur in the marrow, especiall
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