Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 )i Fig. 32.—Sectionthrougli *he roocof a tooth (after KoUiker). C, cement; J, intei'globular spaces D, dentine with dentinal tubes. of bones; and a primary was distinguished from a second- ary method of bone develop- ment. In reality the two processes resemble each other closely. For in the latter case, in conjunction with a precedent deposition of lime, and partial destruction or reduction of the cartilage, there is a new formation
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 )i Fig. 32.—Sectionthrougli *he roocof a tooth (after KoUiker). C, cement; J, intei'globular spaces D, dentine with dentinal tubes. of bones; and a primary was distinguished from a second- ary method of bone develop- ment. In reality the two processes resemble each other closely. For in the latter case, in conjunction with a precedent deposition of lime, and partial destruction or reduction of the cartilage, there is a new formation of a soft connective tissue-substance (osteogenic substance) from the centre outwards, the cells (osteoblasts) of which give rise to bone corpuscle <, and the intermediate tissue becomes the hard basis of bone (fig. 33). More- over, cartilage bones grow in thickness at the expense of the Fig. 33.—a section of ossifying cartilage (after Fray), a, Smaller marrow spaces placed in the cartilage; b, ditto, with cells of the cartilage marrow; c, remains of the calcified cartilage; d, larger marrow spaces; e, osteoblasts.
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