The development of the dentigerous bones and teeth in the hemiramphid fish Dermogenys pusillus (Atheriniformes, Teleostei)
The development of the dentigerous bones and teeth in the hemiramphid fish Dermogenys pusillus (Atheriniformes, Teleostei)
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DOI：
10.1016/s0940-9602(97)80099-4
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发表时间：
1997-04-01
影响因子：
2.2
通讯作者：
Greven, H
中科院分区：
文献类型：
--
作者：
Clemen, G;Wanninger, AC;Greven, H
用组织切片、扫描电子显微镜和透明染色标本等方法，研究了粉刺皮肤病患者牙列和含牙骨骼的发育。出生五天后，下巴无牙的尖端开始长到比上颌尖端更长。生长起源于与Meckel‘s软骨相连的小软骨三角。生长中的软骨棒的软骨周围和软骨骨化呈圆形推进。咽牙板是由含有牙齿的板条状真皮骨与鳃分支的骨质部分融合而成的。因此，牙板是复合骨。腹侧牙板是由两个颈支V和基鳃IV与各自的真皮骨组成的。将成对的咽支III和IV与背侧牙板融合，将咽支II与各自的两个侧牙板融合。咽牙板及其牙齿的元素在出生后开始矿化。没有迹象表明牙齿的根蒂是由釉质器官形成的，釉质器官被牙髓细胞覆盖。釉质器官起源于口咽上皮的基底层，并在颌骨内从唇部向舌部移动，舌部是牙齿形成的地方。咽部齿板上牙齿的原始处位于牙根水平。
The development of the dentition and dentigerous bones was studied in the hemiraphid Dermogenys pusillus using histological sections, scanning electron microscopy, and cleared and stained specimens. Five days after birth, the toothless tip of the lower jaw begins to grow longer than the tip of the upper jaw. The growth originates from small cartilaginous triangles connected with Meckel's cartilage. The peri- and enchondrial ossification of the growing cartilaginous bars advances rostrad. The pharyngeal tooth plates are formed by fusion of the slat-like dentigerous dermal bones with the bony fractions of the gill branches. Hence, the tooth plates are composite bones. The ventral tooth plate ist formed by the two ceratobranchials V and the basibranchial IV together with the respective dermal bones. The paired pharyngobranchials III and IV are fused with the dorsal tooth plate, and the pharyngobranchials II is fused with the two respective lateral tooth plates. Mineralization starts after birth in elements of the pharyngeal tooth plates and their teeth. There are no indications that the pedicel on which the tooth is established is formed by the enamel organ, which is covered by pulpal cells. The enamel organ originates from the stratum basale of the oropharyngeal epithelium and moves within the jaw from labial toward lingual, the site of the establishment of the tooth. The anlage of the tooth on the tooth plates of the pharynx lies at the level of the tooth base.