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首页> 外文期刊>Zoological Studies >Morphology and ultrastructure of the alimentary canal of Oriental fruitfly Bactrocera dorsalis (Hendel) (Diptera : Tephritidae) (I): Thestructure of the foregut and cardia
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Morphology and ultrastructure of the alimentary canal of Oriental fruitfly Bactrocera dorsalis (Hendel) (Diptera : Tephritidae) (I): Thestructure of the foregut and cardia

机译：东方果蝇Bactrocera dorsalis（Hendel）（Diptera：Tephritidae）的消化道的形态和超微结构（I）：前肠和card门的结构

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The foregut and the cardia of Bactrocera dorsalis (Hendel) were investigated by light microscopy and transmission electron microscopy. The foregut of this fly is comprised of a tiny slender tube, the oesophagus, and a lateral diverticulum of the crop. The crop provides a long, smooth duct opening near the end of the oesophagus, and a sac located in the anterior part of the abdomen. The oesophagus and the crop have a thick cuticle (the intima), a thin and simple epithelium, a basement membrane and it is surrounded by a well-developed visceral circular muscle. The cardia is located between the foregut and the midgut, and includes the midgut epithelium in the outer portion of the cardia and the foregut epithelium in the inner portion. The oesophageal epithelium extends into the cardia to form the cardial valve. Both the longitudinal and the circular muscles beneath the oesophageal epithelium form a sphincter to control the entrance of food to the midgut and prevent the regurgitation of the midgut contents. The peritrophic membrane is secreted and forms from the surface of microvilli of the midgut at the anterior part of the cardia.
机译：通过光学显微镜和透射电子显微镜研究了桔小实蝇（Hendel）的前额和the门。该蝇的前额由细小的细管，食管和农作物的侧生憩室组成。作物在食管末端附近提供了一个长而光滑的导管开口，并在腹部的前部有一个囊。食道和农作物具有厚的表皮（内膜），薄而简单的上皮，基底膜，并被发达的内脏环形肌包围。 ia门位于前肠和中肠之间，在includes门的外部包括中肠上皮，在内部包括前肠上皮。食道上皮伸入the门形成form门瓣。食管上皮下面的纵向和环形肌肉均形成括约肌，以控制食物进入中肠并防止中肠内容物反流。肥厚膜被分泌并从the门前部中肠的微绒毛表面形成。

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