Schmidt-Ott U, Technau G M
Institut für Genetik, Zellbiologie, Universität Mainz, Germany.
Development. 1992 Sep;116(1):111-25. doi: 10.1242/dev.116.1.111.
Based on the expression pattern of the segment polarity genes engrailed and wingless during the embryonic development of the larval head, we found evidence that the head of Drosophila consists of remnants of seven segments (4 pregnathal and 3 gnathal) all of which contribute cells to neuromeres in the central nervous system. Until completion of germ band retraction, the four pregnathal segment remnants and their corresponding neuromeres become arranged in an S-shape. We discuss published evidence for seven head segments and morphogenetic movements during head formation in various insects (and crustaceans).
基于分节极性基因engrailed和wingless在幼虫头部胚胎发育过程中的表达模式，我们发现证据表明果蝇的头部由七个体节的残余部分组成（4个前头部体节和3个颚头部体节），所有这些体节都为中枢神经系统的神经节贡献细胞。在胚带回缩完成之前，四个前头部体节残余部分及其相应的神经节呈S形排列。我们讨论了关于各种昆虫（和甲壳类动物）头部形成过程中七个头部体节和形态发生运动的已发表证据。
