Huysseune A
Laboratorium voor Morfologie en Systematick der Dieren, Rijksuniversiteit Gent, 9000 Gent, Belgium.
J Morphol. 1983 Mar;175(3):217-234. doi: 10.1002/jmor.1051750302.
Prominent stages in the development of teeth, associated with the upper pharyngeal jaws in early postembryonic stages of the mouth brooding cichlid A statotilapia elegans were studied on semithin sections in relation to changes in the underlying endoskeletal parts and to the formation of the dentigerous bone. Because the pattern of tooth implantation on infrapharyngobranchial III-IV is constant, at least in early postembryonic stages, it is possible to trace the life history of a given tooth by tracing its homologue throughout the ontogenetic series. A probable causal relationship exists between tooth development and erosion of the underlying cartilage. Fully developed, though unerupted teeth, differentiate annular bone of attachment, which, depending on its position, is formed either outside the cartilage or within the previously induced erosion cavities. Attachment bone of adjacent teeth fuses to build up the dentigerous bone, which, as a result, may be situated within the area previously occupied by cartilage. As soon as the tooth has built up its bone of attachment, it may erupt. The collagenous matrix between tooth and attachment bone persists and gives rise to the movable connection between both. Differentiation of teeth on infrapharyngobranchial III-IV, together with enlargement of the dentigerous bone, proceeds from the lateral and the rostral border, where new germs constantly form. The appearance of new germs on infrapharyngobranchial II is more unpredictable.
对口孵丽鱼优雅星丽鱼胚胎后期早期阶段与上咽颌相关的牙齿发育显著阶段进行了研究，通过半薄切片观察其与下方内骨骼部分的变化以及牙骨的形成之间的关系。由于下咽骨III-IV上的牙齿植入模式是恒定的，至少在胚胎后期早期阶段如此，因此通过在整个个体发育系列中追踪其同源物，有可能追溯特定牙齿的生命史。牙齿发育与下方软骨的侵蚀之间可能存在因果关系。完全发育但未萌出的牙齿会分化出附着环骨，根据其位置，附着环骨要么在软骨外部形成，要么在先前诱导的侵蚀腔内形成。相邻牙齿的附着骨融合形成牙骨，结果牙骨可能位于先前被软骨占据的区域内。一旦牙齿形成了其附着骨，它就可能萌出。牙齿与附着骨之间的胶原基质持续存在，并在两者之间形成可移动连接。下咽骨III-IV上牙齿的分化以及牙骨的增大，从新牙胚不断形成的外侧和吻侧边缘开始。下咽骨II上新牙胚的出现则更不可预测。
