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Quarterly Journal of Microscopical Science, Vol s2-74, 133-150, Copyright © 1930 by Company of Biologists

Memoirs: Development of the Sex Glands of Calotes. I. Cytology and Growth of the Gonads prior to Hatching

CLEVELAND SYLVESTER SIMKINS 1 and J. J. ASANA 2

1 Division of Anatomy, University of Tennessee, School of Medicine, Memphis
2 Department of Biology, Gujarat College, Ahmedabad, India

1. The ventromedian thickening on the mesonephric body gives rise to the cortex of the genital gland and the suprarenal.

2. Nurse-cells are to be found in this thickening, which disappear during the third week of incubation, without influence on the germ-cells.

3. The primary germ-cells arise in the anlage of the gonad while the nurse-cells are degenerating, from elements derived from the germinal epithelium.

4. The gonad at the fourth week is composed of a medullary and cortical portion, the former composed of small cells, some of which begin to arrange themselves into incipient cords before hatching; the latter is composed of large cells and probably represents the thickened germinative epithelium.

5. There is a tendency towards sexual differentiation at hatching, but sex is not yet definitely established.






© The Company of Biologists Ltd 1930