CHICK GONADOGENESIS FOLLOWING EARLY SURGICAL BURSECTOMY .2. ULTRASTRUCTURAL DATA ON THE EMBRYONIC LEFT AND RIGHT FEMALE GONADS

We examined the ultrastructural characteristics of the medullary stero idogenic cells in left and right female gonads of surgically bursectom ized chick embryos killed on the 17th day of incubation. The steroidog enic cells of the bursectomized embryos have a more developed system o f cisternae in the smooth endoplasmic reticulum than controls, and the ir mitochondria show some alterations in the density of the matrix and in the shape of the cristae. On the basis of these results, an enhanc ement of the steroidogenic activity in both gonads is suggested.