| 单词 | dermal bone |
| 释义 | > as lemmasdermal bone dermal bone n. Zoology a bone that does not have a cartilaginous precursor and is formed by differentiation of dermal mesenchyme cells into osteoblasts; spec. one which is connected with the ectodermal basement membrane by dentine or enamel, or which is homologous with such a bone. ΚΠ 1833 G. A. Mantell Geol. South-east of Eng. 327 There cannot exist a doubt that these are dermal bones to which the scales of the animal were attached. 1902 Proc. Zool. Soc. 1 208 Exquisite examples of true dermal bones are those ossifications ‘within the skin’ which in Amphibia and Reptiles are now generally called osteoderms. 1986 A. S. Romer & T. S. Parsons Vertebr. Body (ed. 6) viii. 242 The anterior part of the palatal complex is an essentially horizontal plate of dermal bone. 2002 Paleobiology 28 475/2 The dermal and oral skeleton, which is composed of the teeth, scales, fin spines, and dermal bones of vertebrates, particularly lower vertebrates, is primitively the most extensive. < as lemmas |
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