Abstract
A morphological and histochemical study has been made of follicular atresia and interstitial gland tissue in the ovary of the pigeon ( Columba livia) and ring dove ( Streptopelia decaocto). The building up of interstitial gland tissue of thecal origin is related to the atresia of previtellogenic and very early vitellogenic follicles. Their granulosa cells, after removing the ooplasmic contents, degenerate and disappear. The thecal-type interstitial gland cells distributed either in groups or singly in the ovarian stroma accumulate lipid droplets consisting of cholesterol, and/or its esters, triglycerides, and some phospholipids.
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