A text-book of dental histology and embryology, including laboratory directions . nective-tissue cells, which probably become osteoblasts; c, outer layer,or coarse fibrous layer, in which fusiform fibroblasts are also rendered apparentby double staining with hematoxylin and carmine; d, some remains of the reticulartissue connecting the superimposed tissue with the periosteum, (jj immersion.)(Black.) osteoblasts which are building subperiosteal bone in theyoung animal, processes of their cytoplasm extending intothe canaliculi of the matrix which they have formed. Atone point in the illustration
A text-book of dental histology and embryology, including laboratory directions . nective-tissue cells, which probably become osteoblasts; c, outer layer,or coarse fibrous layer, in which fusiform fibroblasts are also rendered apparentby double staining with hematoxylin and carmine; d, some remains of the reticulartissue connecting the superimposed tissue with the periosteum, (jj immersion.)(Black.) osteoblasts which are building subperiosteal bone in theyoung animal, processes of their cytoplasm extending intothe canaliculi of the matrix which they have formed. Atone point in the illustration the osteoblasts are pulled offfrom the surface of the bone and show these processesstretched out of the canaliculi. ATTACHED PERIOSTEUM 267 Complex Unattached Periosteum.—In some places, espe-cially where muscles or tendons perform sliding movementsover an unattached periosteum, the outer layer, instead ofbeing simple, may be very complex. This is illustrated inDr. Blacks drawing (Fig. 209), from the periosteum of thetibia of a young pig. In this instance the outer layer is. Periosteum from the shaft of the tibia of the pig, lengthwise section, showing thecomplex arrangement of fibers in the coarse or outer fibrous layer that sometimesoccurs under muscles that perform sliding movements upon it: B, bone; 0, layer ofosteoblasts. The tissue has been pulled slightly away from the bone in mounting thesection, and part of the osteoblasts have clung to the bone, some have clung to thetissues, while others are suspended midway, their processes clinging to each, a layerof fine fibers; inner or osteogenetic layer of the periosteum; b, first lamina of the coarseor outer fibrous layer, the fibers of which are, in this case, circumferential, exposingthe cut ends. It will be observed that there are ten lamina in the make up of the outerlayer, the lengthwise and circumferential fibers alternating. The ones marked /and i are very delicate ribbon-like forms, which have shifted from their nor
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
