① primordia| follicle -oocyte: primary oocyte /30um in d /large, vesicular nucleus /slight eosinophilic cytoplasm follicular cell: a layer of flattened cell① primordial follicle ---oocyte: primary oocyte /30um in D /large, vesicular nucleus /slight eosinophilic cytoplasm ---follicular cell: a layer of flattened cell