| 陶淑云,饶小珍,林岗.2015.龟足白垩腺的组织学和超微结构.动物学杂志,50(3):445-456. |
| 龟足白垩腺的组织学和超微结构 |
| Observation on Histology and Ultrastructure of the Cement Apparatusof Capitulum mitella |
| 投稿时间：2014-08-13 修订日期：2015-05-22 |
| DOI：DOI: 10.13859/j.cjz.201503015 |
| 中文关键词: 龟足 白垩腺 组织学 超微结构 |
| 英文关键词:Capitulum mitella cement apparatus histology ultrastructure |
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| 中文摘要: |
| 应用光学显微镜和透射电子显微镜对龟足白垩腺的组织学和超微结构进行观察。龟足白垩腺由腺细胞和管道系统组成,整个外周覆有一层结缔组织鞘,在结缔组织鞘中可见成纤维细胞。腺细胞为单细胞腺,腺细胞的发育与个体发育不同步。年幼腺细胞较小,形态为圆形或椭圆形,细胞核也为圆形或椭圆形。随着腺细胞的发育,细胞及其细胞核逐渐变大,形状不规则具多态性。成熟腺细胞细胞质电子密度高,充满大量的粗面内质网和游离的核糖体；线粒体也很丰富,但未见高尔基体。细胞质内含丰富的颗粒状物质以及大小不一的囊泡。细胞质中小囊泡的聚集和融合形成了大囊泡即胞内管。管道系统根据位置和功能划分为四个层次：胞内管、收集管、次级管、初级管。收集管、次级管、初级管的管壁均由单层上皮细胞组成,初级管较收集管和次级管大且内腔具有几丁质层。收集管的管壁上皮细胞与腺细胞形成隔状连接,各级管壁上皮细胞之间也形成隔状连接,这种结构保证了管道的紧密性。 |
| 英文摘要: |
| Histology and ultrastructure of the cement apparatus of Ｃapitulum miteila were observed by a light microscope and electron microscope.The result showed that the cement apparatus of Ｃapitulum miteila is consisted of cement gland cell and canal system.The entire apparatus is sheathed in a layer of connective tissue, inside of which fibroblasts can be seen. Gland cell is a unicellular gland.The development of cement gland cell and animal itself is not synchronous. The young cement cells are small, and the shapes of cells and nucleus are round, ovoid . With the development of gland cells, the gland cells and their nucleus enlarge, and their shapes become irregular with polymorphism. The cytoplasm of mature gland cells, the electron density of which is high, is full of a lot of the rough endoplasmic reticulum and free ribosomes, a few mitochondria, but no Golgi apparatus. The cytoplasm contains a wealth of particulate matter and sizes of vacuoles. The formation of the intracellular canal in cement glands is via aggregation and fusion of cytoplasmic vacuoles. The canal system system is divided into four levels depending on location and function: intracellular duct, collection duct, secondary duct, principal duct. The collection canals, secondary canals and principal canals are composed of monolayer epithelial cells. The principal duct is larger than secondary duct and collection duct. The cavity of the principal duct has chitinous layer. Septate junctions connect cement gland cells with wall cells of the collector canal. The wall epithelial cells of canals are also connected by septate junctions. This structure ensures the tightness of the canal system. |
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