XB-IMG-159761
Xenbase Image ID: 159761
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Fig. 7. Structure of developing ovaries. A. Early ovary at NF55; all oogonia (og) are attached to the surface epithelium in the ovarian cortex, cells of the ovarian medulla transform into monolayer epithelium lining the secondary ovarian cavity (asterisk); 2 basal laminae (arrows) separate stroma from the cortex and medulla. B. Developing ovary at NF56; in the thickening cortex. The primary oogonia (arrow) enclosed individually by somatic cells and ovarian cysts containing groups of secondary oogonia (arrowhead) are present. C. EM image of ovarian cyst containing secondary oogonia (ogII) surrounded by flattened pre-follicular cells (pfc) in contact with surface epithelium (se); arrowheads indicate numerous cell junctions between somatic cells. D. First meiotic cells (zygotene stage, Z) are present in the ovary at NF57 (cross section through internodal region – no medulla or cavity is present); melanophores (black cells) are present in the stroma. E. First diplotene oocytes (oc) appear at NF58 near the ovarian cavity (asterisk). F. Thick ovarian cortex contains numerous germ cells; all oogonia (og) are present just under surface epithelium (se), diplotene oocytes are located near the ovarian cavity (asterisk), cysts containing zygotene oocytes are located in the middle; blood vessels (bv) and melanophores (black cells) are scattered between ovarian cysts. G. EM image showing surface layers of the ovary: surface epithelium (se), basal lamina (arrow), stroma (st), basal lamina (arrow), follicular cells (fc), diplotene oocyte (oc). H. EM image of layers enclosing diplotene oocyte (oc): follicular cell (fc), basal lamina (arrow), stroma (st), basal lamina (arrow), epithelium (e) lining ovarian cavity (asterisk). I. Scheme of the ovarian wall. Scale bars: A,B,D-F 20 µm; C,G-J 3 µm. Image published in: Piprek RP et al. (2017) Copyright © 2017. Image reproduced with permission of the Publisher, Elsevier B. V. Larger Image Printer Friendly View |