Structures of ovary and ovarian follicle in the flathead lobster, Thenus orientalis (Lund, 1793)(Crustacea:Decapoda:Scyllarida)

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.