Ultrastructural and histochemical characteristics of the lateral oviducts of Baculum thaii Haus. (Phasm.).
The wall of the lateral oviducts of baculum thaii is composed of a monolayered epithelium, lacking a cuticular intima, which lies on a sheath of striated muscular fibres. Untreated oviductal specimens exhibit two distinct regions. The anterior region, into which the various ovarioles emerge, is opalescent. The posterior region is more dilated and darker in colour. On the basis of the ultrastructural characteristics of the epithelial cells, four successive zones are definable for each oviduct. The first two zones comprise the most anterior oviductal area while the third and fourth comprise the posterior region. In zone 1 only is the oviductal wall composed of a single cell type. In addition, differences in structural organization between mated and virgin females were observed in this zone alone. In the three remaining zones, two distinct cell types were distinguishable according to two models of fundamental organization: cells having numerous apical microvilli and dome-shaped cells. The results of histochemical analyses established that the abundant secretory product elaborated by the epithelial cells is rich in both proteins and predominantly acidic mucosubstances. The histochemical characteristics of the secretory product differentiate significantly not only between the four zones in the same individual but also when the corresponding zones are compared in the mated and virgin females.
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Dipartimento di Biologia Animale, Università degli studi di Catania, Italia.
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Narcisi
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D000818:Animals; D005260:Female; D006651:Histocytochemistry; D007313:Insecta / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D010057:Oviducts / Q000737:chemistry / Q000648:ultrastructure