Figure 212

Schematic diagram of the stages of testicular development, a. This diagram shows the 5-week embryo in the stage of indifferent gonads. The gonadal ridges visible on the posterior abdominal wall are being infiltrated by primordial germ cells (green) that migrate from the yolk sac. Most of the developing gonad is formed by mesenchyme derived from the coelomic epithelium. The primordial germ cells become incorporated in the primary sex cords, b. At a later stage, under hormonal influence of testis-determining factor (TDF), the developing gonad initiates production of testosterone. This is followed by differ mesorchium duct of

degenerating paramesonephric septum seminiferous cord degenerating mesonephric tubule mesonephric duct proliferating coelomic epithelium developing rete testis mesorchium seminiferous cords paramesonephric duct tunica albugĂ­nea duct of degenerating paramesonephric

efferent ductule testis septum seminiferous cord

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