File:Ovary histology 061c.jpg

Ovary - Secondary Follicle

• Small fluid-filled spaces become visible between the granulosa cells as the follicle reaches a diameter of about 400 µm.
• These spaces enlarge and fuse to form the follicular antrum, which is the defining feature of the secondary follicle.
• The oocyte is now located eccentric in the follicle in the cumulus oophorus, where it is surrounded by granulosa cells.
• The theca folliculi differentiates with the continued growth of the follicle into a theca interna and a theca externa.
• Vascularization of the theca interna improves, and the spindle-shaped or polyhedral cells in this layer start to produce oestrogens.
• The theca externa retains the characteristics of a highly cellular connective tissue with smooth muscle cells.
• The oocyte of the secondary follicle reaches a diameter of about 125 µm.
• The follicle itself reaches a diameter of about 10-15 mm.

Links: Image-Secondary Follicle ullabeled | Image-Secondary Follicle labeled | Ovary Development | Oocyte Development

Image Links: large 1000px | medium 800px | small 400px

File:Ovary_histology_006.jpg

Ovary, monkey H&E reproductive system, female, secondary follicle, cumulus oophorus, zona_pelucida,_granulosa_cells,_oocyte x20

Ovary histology: Tunica Albuginea x20 | Tunica albuginea, Germinal epithelium x40 | Primary follicle, primordial follicle, oocyte, x40 | Secondary follicle, cumulus oophorus, zona pelucida, granulosa cells, oocyte x20 | Corpus luteum, theca lutein cells, granulosa lutein cells, Loupe | Corpus luteum, theca lutein cells, granulosa lutein cells, x10 | Corpus luteum, theca lutein cells, granulosa lutein cells, x40 | Corpus albicans, primary follicle, primordial follicle, granulosa cells, oocyte x20 | Menstrual Cycle | Ovary Development

Links: Histology | Histology Stains | Blue Histology images copyright Lutz Slomianka 1998-2009. The literary and artistic works on the original Blue Histology website may be reproduced, adapted, published and distributed for non-commercial purposes. See also the page Histology Stains.

Cite this page: Hill, M.A. (2024, April 23) Embryology Ovary histology 061c.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Ovary_histology_061c.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G