Distribution of epithelial cords and primary follicles in the ovarian cortex. Panoramic view composed of nine images shows ovarian tunica albuginea filled with CK18+ mesenchymal cells, upper cortex (uc) with epithelial channels (black arrowhead), cords (dashed and white arrowheads – see right inset) and follicle-like structures (solid box, see upper left inset for details). Lower cortex (Ic) shows isolated (dashed box – see lower left inset) and grouped primary follicles (dotted box). Bars in insets indicate μm. Cytokeratin 18 immunostaining, hematoxylin counterstain.