Abstract
In a study of 71 female foetuses, gonadal blastema was observed at 1.5 cm crown rump length (CRL). Oogonial cells entered the meiotic prophase at 3.5-6.0 cm CRL, which was arrested at the dictyotene stage to produce primary oocytes which formed primordial follicles. Primordial follicles were observed at 6-8 cm CRL. All germinal cells were at dictyotene by 20-24 cm CRL and follicles developed to primary and secondary stages. Folliculogenesis dominated further ovarian development and reached a peak between 32 and 35 cm CRL. In seven of the 12 foetuses measuring between 41 and 72 cm CRL, many follicles were atretic and some luteinized. The luteal bodies were composed of hypertrophied theca and granulosa cells with homogeneous and eosinophilic cytoplasm.
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