Xenbase Image ID: 159762

Fig. 8. Structure of developing testes. A. Early testes at NF55; all spermatogonia (g) are dispersed among somatic cells with small, dark nuclei, and do not contact surface epithelium. B. First signs of groups of spermatogonia (outlined) are discernible at NF56. C. Formation of the testis cords at NF58. D, E. The testis cords (outlined) during completion of metamorphosis (NF66); each cord becomes enclosed by basal lamina (arrow); a small cluster of somatic cells that will give rise to the rete testis is visible in the testis center. F. EM image of testis cord; spermatogonia (g) and pre-Sertoli cells (pSc) are enclosed by basal lamina (arrow). G, H. Dark cells ingress (ic) inside the gonad from the superficial epithelium (se) at NF56. Scale bars: A-E 20 µm; F-H 3 µm. Image published in: Piprek RP et al. (2017) Copyright © 2017. Image reproduced with permission of the Publisher, Elsevier B. V. Larger Image Printer Friendly View

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