. Text-book of normal histology: including an account of the development of the tissues and of the organs. the vault of the cranium, of the face, and of part of the lower jaw,the skeleton is mapped out, in its foetal condition, by solid cartilageswhich correspond in form more or lessclosely with the future bones. Theprimary embryonal cartilage is ofthe hyaline variety, being extremelyrich in cells, many of which are engagedin division; the cell-groups are separatedby a relatively small amount of inter-cellular substance, and the outer surfaceof these solid cartilages is closely in-vested by an
. Text-book of normal histology: including an account of the development of the tissues and of the organs. the vault of the cranium, of the face, and of part of the lower jaw,the skeleton is mapped out, in its foetal condition, by solid cartilageswhich correspond in form more or lessclosely with the future bones. Theprimary embryonal cartilage is ofthe hyaline variety, being extremelyrich in cells, many of which are engagedin division; the cell-groups are separatedby a relatively small amount of inter-cellular substance, and the outer surfaceof these solid cartilages is closely in-vested by an important membrane, theprimary periosteum. When bone is formed at the centresof ossification within the cartilage, it istermed endochondral bone; whenformed directly from and beneath theperiosteum, periosteal bone. While quite complicated in itssequence of changes, it must be remembered that endochondraldevelopment results in the formation of structures which are largelytemporary, and which finally, for the most part, suffer permanent bones of the skeleton are, chiefly, the products of. Primary embryonal cartilage repre-senting one of the carpal bones : /,perichondrium, or primary periosteum ;«, nutrient canals extending from theperiphery.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiajblipp
