Fine structure of the pyloric region and Malpighian papillae of protura (Insecta Apterygota)
Fine structure of the pyloric region and Malpighian papillae of protura (Insecta Apterygota)
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幽门区和 Protura（昆虫纲 Apterygota）马尔皮基乳头的精细结构
DOI：
10.1002/jmor.1051500307
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发表时间：
1976
影响因子：
1.5
通讯作者：
R. Dallai
中科院分区：
文献类型：
--
作者：
R. Dallai
描述了古龙属和Acerentomon（昆虫纲，原尾目）的幽门区。在这两个物种的中肠后部细胞携带短微绒毛。在上皮细胞下面有一个肌肉幽门括约肌，用于关闭肠腔。在括约肌后面是一个宽阔的幽门腔，里面排列着细胞，细胞有很长的微绒毛，微绒毛向前指向中肠。这些细胞调节肠内容物进入后肠的通道。分泌物从马尔皮基乳头发射到肠道在这一水平。在古龙属中，马尔皮基氏乳头中有三个区域（R1、R2和R3）可见，而在Acerentomon中则没有R1区域。R1区含有分泌细胞，分泌细胞具有精细的含糖蛋白颗粒。R2区由有点类似于昆虫马氏管分泌细胞的细胞组成。推测R1和R2细胞将分泌物排放到每个乳头的中央腔中。R3的细胞形成分泌管。这表明，R2区域代表一个基本的排泄区，共同的原尾，而R1区域，在Eosentomon，可能是一个专门的区域执行补充排泄功能。
The pyloric region of Eosentomon and Acerentomon (Insecta, Protura) is described. In both species the posterior cells of the midgut carry short microvilli. Beneath the epithelial cells there is a muscular pyloric sphincter for closing the intestinal lumen. Behind the sphincter is a wide pyloric chamber lined by cells with very long microvilli which point anteriorly toward the midgut. These cells regulate the passage of the intestinal contents into the hindgut. Secretions from the Malpighian papillae are emitted into the gut at this level. In Eosentomon three regions (R1, R2 and R3) are visible in the Malpighian papillae, whereas in Acerentomon region R1 is lacking. The R1 region contains secretory cells with elaborate glycoprotein‐containing granules. The R2 region is composed of cells somewhat resembling the secretory cells of Malpighian tubules of insects. Presumably R1 and R2 cells emit secretions into the central cavity of each papilla. Cells of R3 form a duct for the secretion. It is suggested that the R2 region represents a basic excretory region, common to Protura, whereas the R1 region, in Eosentomon, may be a specialized area performing supplementary excretory functions.