Morphology and ultrastructure of the esophagus during the ontogeny of the spider crab Maja brachydactyla (Decapoda, Brachyura, Majidae)

Journal of Morphology
Diego CastejónGuillermo Guerao

Abstract

The esophagus of the eucrustaceans is known as a short tube that connects the mouth with the stomach but has generally received little attention by the carcinologists, especially during the larval stages. By this reason, the present study is focused on the morphology and ultrastructure of the esophagus in the brachyuran Maja brachydactyla during the larval development and adult stage. The esophagus shows internally four longitudinal folds. The simple columnar epithelium is covered by a thick cuticle. The epithelial cells of the adults are intensively interdigitated and show abundant apical mitochondria and bundles of filamentous structures. The cuticle surface has microspines and mutually exclusive pores. Three muscle layers surrounded by the connective tissue are reported: circular muscles forming a broad continuous band, longitudinal muscle bundles adjacent to the circular muscles, and dilator muscles crossing the connective tissue vertically toward the epithelium. The connective tissue has rosette glands. The esophagus of the larvae have epithelial cells with big vesicles but poorly developed interdigitations and filamentous structures, the cuticle is formed by a procuticle without differentiated exocuticle and endocuticle, ...Continue Reading

References

Nov 30, 1979·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·R M Robertson, M S Laverack
Nov 1, 1969·Journal of Ultrastructure Research·E R WitkusW J Smith
Dec 1, 1968·Archivum Histologicum Japonicum = Nihon Soshikigaku Kiroku·T Komuro, T Yamamoto
Jan 1, 1996·Pflügers Archiv : European journal of physiology·G Vogt
Jul 2, 2015·Journal of Morphology·Diego CastejónGuillermo Guerao
Jan 1, 1983·Journal of Morphology·Eugene H Schmitz, Patricia M Scherrey

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