Figure 2118

Diagram depicting the hormonal regulation of male reproductive function. Blue arrows indicate stimulatory action on the system; red arrows indicate inhibitory feedback. See text for explanation.

Leydig cells

GnBH-like peptjdes spermatogenic cells

estradiol

other CNS centers

inhibin testosterone

• accessory reproductive organs

• secondary sexual characteristics

• metabolic effects

• behavioral effects hypothalamus l

GnRH

other CNS centers inhibitory stimulatory adenohypophysis

Leydig cells

\ Sertoli cells estradiol

GnBH-like peptjdes spermatogenic cells

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