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Figure 4 | BMC Veterinary Research

Figure 4

From: Growth and development of the ovary and small follicle pool from mid fetal life to pre-puberty in the African elephant (Loxodonta africana)

Figure 4

Photographs taken above a light box of 25 μm thick sections of fetal elephant ovaries recovered between 15 and 21 months of gestation (Scale bar = 10 mm). a) 15.2 months; the cortical region surrounds a central medulla filled with small growing and antral follicles and dark staining interstitial tissue. b) 16.7 months; showing maximum recorded antral follicle development. c) 17.1 months; the number of antral follicles is less than in (b) and more interstitial tissue is apparent. d) 17.5 months; increasing vascularisation of the ovary is apparent. e) 19.3 months; ovarian size has increased significantly from (d) due to hypertrophy and hyperplasia of interstitial cells. f) 20.2 months; the fetal ovary is approaching maximum size. Few antral follicles remain and, as in e), the interstitial tissue is partially obscured by extravasated red blood cells.

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