A text-book of dental histology and embryology, including laboratory directions . Periostealbud 1 Calcifiedmatrix 4 Perichondral _,._ bone The place marked X in the preceding figure with stronger magnification.(185 X) (Szymonowicz). the centre in both directions, and all stages, from the typicalhyaline cartilage to the formation of bone, may be seen inone section. These stages are illustrated by Figs. 204, 205,and 206. From now on the bone grows by progressive transforma-tion of cartilage and by the growth of bone under the peri-osteum, which will be considered under bone 258 BONE FO
A text-book of dental histology and embryology, including laboratory directions . Periostealbud 1 Calcifiedmatrix 4 Perichondral _,._ bone The place marked X in the preceding figure with stronger magnification.(185 X) (Szymonowicz). the centre in both directions, and all stages, from the typicalhyaline cartilage to the formation of bone, may be seen inone section. These stages are illustrated by Figs. 204, 205,and 206. From now on the bone grows by progressive transforma-tion of cartilage and by the growth of bone under the peri-osteum, which will be considered under bone 258 BONE FORMATION AND GROWTH Endomembranous Bone Formation.—The bones which arenot preformed in cartilage are formed directly from fibrous Fig. 206 i Periosteum*.^ H\ Enlargedcartilagecells Endochondralbone Periosteal bud*~- Blood-vessels filled with blood. Calcified £cartilage From longitudinal section of a finger of a four months embryo. Only the diaphysisof the second phalanx is represented. (85 X) (Szymonowicz.) tissue. This is well illustrated in the mandible. In theregion of Meckels cartilage and between it and the develop-ing tooth germs the mesenchyme begins to show signs of ENDOMEMBRANOUS BONE FORMATION 259 specialization. Delicate fibers appear in the intercellularsubstance. Along these the connective-tissue cells arrangethemselves, and, taking on the form of osteoblasts, begin to Fig. 207
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
