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題名 | Morphology and Ultrastructure of Hindgut of the Oriental Fruit Fly Bactrocera Dorsalis (Diptera: Tephritidae)=東方果實蠅Bactrocera Dorsalis後腸形態及超薄結構之研究 |
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作者 | 李文蓉; 林泰郎; Lee, Wen-yung; Lin, Tai-lung; |
期刊 | 臺灣昆蟲 |
出版日期 | 20030600 |
卷期 | 23:2 民92.06 |
頁次 | 頁113-128 |
分類號 | 387.795 |
語文 | eng |
關鍵詞 | 幽門部; 迴腸; 直腸瓣; 直腸; Ileum; Pylorus; Rectal valve; Rectum; |
中文摘要 | 本研究報告係利用光學顯微鏡和穿透性電子顯微鏡方法,觀察研究東方果實蠅Bactrocera dorsalis(Hendel)後腸(hindgut)之形態和超薄顯微的構造。它的後腸可分為四部份:幽門部(pylorus)、迴腸(ileum)、直腸瓣(rectal valve)和直腸(rectum)。幽門部位於中腸與後腸的迴腸間,為一小梨形構造,其結構分內外兩層,內層再分為兩層,內層的上皮細胞層係連接中腸上皮細胞層,基部向上彎而形成兩層。外層則連續迴腸細胞。其腸腔為中腸到後腸的通道。迴腸為一彎曲的長管道,其表皮(cuticle),只有上表皮,細胞的上質膜和基質膜皆向細胞內突,形成許多小管(canaliculi),這些小管多與粒線體靠近。迴腸被環肌和縱走肌包圍著。直腸瓣係一短小而狹窄的小管體,位於迴腸末端,連接直腸,直腸瓣的表皮很厚,形成瓣狀,上皮細胞退化,環走肌發達,縱走肌闕如。直腸為一囊狀體,東方果實蠅的直腸為雌雄不同形,雌蠅直腸呈橢圓形,前端具四個直腸突起的突出構造,雄蠅直腸呈S形,前端有四個直腸突起的突出,後端膨大為儲藏部(reservoir)和分泌囊(secretory sac)。性成熟交尾時,雄蠅直腸膨脹呈球狀,雌蠅直腸不會變化。直腸壁的微細結構,表皮可分為上表皮和內表皮,上皮細胞結構簡單,具有粒線體,內質網,游離的核醣體和空泡等。外圍有發達的環走肌和縱走肌。雄蠅直腸前端的腸壁與雌蠅直腸者之結構相似,但後端腸壁的上皮細胞特別加厚,細胞質複雜,外被有發達的肌肉層包圍著。 |
英文摘要 | The hindgut of the Oriental fruit fly, Bactrocera dorsalis (Hendel), was studied with light and transmission electron microscopy. The hindgut of this fly consists of the pylorus, ileum, rectal valve, and rectum. The pylorus is a bulbously shaped structure located between the midgut and ileum of the hindgut. The structure of the pylorus is composed of two layers: the epithelium of the outer layer which connects to the epithelium of ileum and the inner layer which extends from the epithelium of the midgut and appears as two lines. The lumen of the pylorus is the pathway from the midgut to the hindgut. The ileum is shaped like a cylindrical winding tube, and its epithelium is covered only by an epicuticle. The apical and basal plasma membranes of the epithelial cell are infolded into the cell to form the canaliculi, which are closely associated with the mitochondria. The mitochondria are well developed with numerous cristae. The musculature coat is well developed with circular and longitudinal muscles. The rectal valve is a very short small tube located between the ileum and rectum. Its epithelium has a very thick cuticle, particularly the endocuticle. The epithelial cells are undeveloped and only surrounded by a thick circular muscle, but not by the longitudinal muscle. The rectum is an enlarged sac with sexual dimorphism. The female rectum appears elongate and a round bottom and two pairs of conical rectal papillae on the anterior region. The male rectum is S-shaped, with the enlarged posterior region forming the reservoir and secretory sac. During mating activity, the entire rectum enlarges like a balloon. The ultrastructure of the rectal wall in both the female and male is the same in the anterior regions, but differs in the posterior region. The posterior rectal wall of the female is the same as the anterior region, while that of the male has a much thicker epithelium and a more-complicated cytoplasm compartment. The musculature coat of the rectum is well developed in both the male and female. |
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