河蚌结缔组织细胞发生及发育观察

对河蚌外套膜组织学观察发现,外套膜结缔组织发源于细胞聚合体。聚合体细胞发育形成结缔组织细胞及组织构造。外套膜边缘“类聚合体”细胞增殖和发育形成边缘结缔组织。聚合体细胞发育形成不同形状细胞(成纤维细胞和颗粒细胞)。两者不断变化:成纤维细胞积累颗粒最终发育成球状颗粒细胞。球状细胞解体释放颗粒后恢复分泌纤维质状态。纤维物质重新组合排列构成贝体组织骨架,颗粒物质参与贝壳形成。

OBSERVATION ON CYTOGENESIS AND DEVELOPMENT OF THE CONNECTIVE TISSUE IN SOME FRESHWATER MOLLUSKS

Histological observation on the mantles in some freshwater mollusksindicate that the connective tissue of the mantle originate from cell-polymerized-mass(CPM). The cytogenesis of CPM usually take place in a kind of sac structureand the reproduction of cells inside the sac can form many 3 to 20 GPM that dissi-milar in size, each are made up of a large number of cells with no intercellular sub-stance. As CPM develops, the sac wall breaks and CPM get out of the sac. Finally,the cells of CPM disperse into the connective tissue surroundings. There are otherkind of quasi-cell-polymerized-mass(QCPM) distributed over the marginal mantle.The process of cytogenisis and development of QCPM are observed and are compar-ed with OPM, and indicate that QCPM made the formation of both histocyte andhisto--structure of the connective tissue of the marginal mantle. As the CPM develops, some different cells such as fibroblastes and granule cellsare formed. The transformation between these two kinds of cells are constantly occu-rred: fibroblasts gradually accumulate the granule slime uacuoles and finally developinto spherelike granule cells. Sphere-Like granute cell revert to the original stateafter the slime vacuoles were released. Therefore, as the new connective tissue for-med from the developments of the CPM or QCPM, two kinds of secretory materialare produced, ie. fibrous material and granule slime vacuoles, the former constitutesthe fundamentals of the connective tissue while the latter is related to the formationof the shell.