Tarby Melissa L, Webb Jacqueline F
Department of Biology, Villanova University, Villanova, Pennsylvania 19085, USA.
J Morphol. 2003 Jan;255(1):44-57. doi: 10.1002/jmor.10045.
The development of two of the cranial lateral line canals is described in the cichlid, Archocentrus nigrofasciatus. Four stages of canal morphogenesis are defined based on histological analysis of the supraorbital and mandibular canals. "Canal enclosure" and "canal ossification" are defined as two discrete stages in lateral line canal development, which differ in duration, an observation that has interesting implications for the ontogeny of lateral line function. Canal diameter in the vicinity of individual neuromasts begins to increase before ossification of the canal roof in each canal segment; this increase in canal diameter is accompanied by an increase in canal neuromast size. The mandibular canal generally develops later than the supraorbital canal in this species, but in both of these canals development of the different canal segments contained within a single dermal bone is asynchronous. These observations suggest that a dynamic process requiring integration and interaction among different tissues, in both space and time, underlies the development of the cranial lateral line canal system. The supraorbital and mandibular canals appear to demonstrate a "one-component" pattern of development in Archocentrus nigrofasciatus, where the walls of each canal segment grow up from the underlying dermal bone and then fuse to form the bony canal roof. This is contrary to numerous published reports that describe a "two-component" pattern of development in teleosts where the bony canal ossifies separately and then fuses with an underlying dermal bone. A survey of the literature in which lateral line canal development is described using histological analysis suggests that the occurrence of two different patterns of canal morphogenesis ("one-component" and "two-component") may be due to phylogenetic variation in the pattern of the development of the lateral line canals.
本文描述了丽鱼科鱼类黑带丽体鱼（Archocentrus nigrofasciatus）颅侧线管道中两条管道的发育情况。基于对眶上管和下颌管的组织学分析，定义了管道形态发生的四个阶段。“管道包被”和“管道骨化”被定义为侧线管道发育中的两个不同阶段，它们在持续时间上有所不同，这一观察结果对侧线功能的个体发育具有有趣的启示。在每个管道节段的管顶骨化之前，单个神经丘附近的管道直径开始增加；管道直径的这种增加伴随着管道神经丘大小的增加。在该物种中，下颌管通常比眶上管发育得晚，但在这两条管道中，单个真皮骨内包含的不同管道节段的发育是不同步的。这些观察结果表明，一个需要不同组织在空间和时间上进行整合与相互作用的动态过程是颅侧线管道系统发育的基础。在黑带丽体鱼中，眶上管和下颌管似乎呈现出一种“单组分”发育模式，即每个管道节段的壁从下方的真皮骨向上生长，然后融合形成骨管顶。这与众多已发表的报告相反，这些报告描述了硬骨鱼的“双组分”发育模式，即骨管先单独骨化，然后与下方的真皮骨融合。一项使用组织学分析描述侧线管道发育的文献调查表明，两种不同的管道形态发生模式（“单组分”和“双组分”）的出现可能是由于侧线管道发育模式的系统发育差异。
