摘要:
卵巢包括4种形态的组分:(1)卵巢壁,(2)生殖上皮,(3)卵母细胞(早期卵巢还包括卵原细胞)一滤泡细胞层,(4)卵巢壁内突.卵巢壁及壁内突均含有血管、血窦、肌细胞等成分,卵巢壁内突延伸至每个滤泡的外层基膜处.滤泡由内至外由卵母细胞、卵周隙、滤泡细胞及基膜等4部分组成.卵母细胞膜表面向卵周隙内伸出许多微绒毛,并具有许多微吞饮凹.随着滤泡的发育,卵周隙内含物电子密度越来越大,成熟滤泡的卵周隙内含物演变为卵壳.卵壳由两部分构成:外层较薄,而内层较厚且含电子致密的颗粒物质.滤泡细胞一般为单层,具较强的合成活性,其合成产物系卵周隙内含物的一部分.东方扁虾卵巢和滤泡的结构特征表明外源性(卵母细胞外及卵巢外)的卵黄合成在卵黄发生上起重要的作用.
Abstract:
The ovary contains four morphological components:(1) the ovarian wall, (2) the reproductive epithelium, (3) the cellular layer containing oocytes, oogonia(especially for early-developing ovary) and follicle cells and (4) the extensions of the ovarian wall.The ovarian wall and its extensions consist of blood vessels, sinuses, muscle cells and others.The extensions of the ovarian wall project into among the follicles and insert on the thick basal membrane of each follicle.From inside to outside, the follicles are composed of four parts:(1) the oocyte, (2) the perivitelline space, (3) the follicle cells and (4) the basal membrane.The surface of the oocyte during vitellogenesis is folded into numerous long microvilli that project into the perivitelline space between the oocyte surface and the base of the follicle cell layer.In addition, the plasma membrane of the vitello genic oocyte contains many pinocytotic pits.The perivitelline space is engorged with more electron-denser material as the development of the follicle.The inclusion of perivitelline space in the mature follicle is named specially as the chorion.The chorion is composed of two region:a thinner exochorion and a thicker endochorion containing electron-dense granular material.The follicle cell layer is composed of a single layer of polygonal follicle cells which exhibit higher synthetic activity.The synthetic product of the follicle cell layer is one source for the inclusion of the perivitelline space.The structure of the ovary and ovarian follicle in T.orientalis show that the exogenously biosynthetic yolk play important roles in the vitellogenesis.
下载:
