How does the endocrine system develop the reproductive system?

The reproductive system is influenced by the early developments in the endocrine system. Developmental biologists indicate that hormones exert their influence as early as six or seven weeks into embryonic development. At this point, undifferentiated tissue with the potential of developing into either a female or a male reproductive system will develop into a male system in the presence of testosterone and into a female system in its absence. There is some evidence that the embryonic hormones have an effect on the developing brain, producing either a male or female brain. Functionally, this may account for the cyclic activity of female reproductive hormones and the noncyclic activity of male hormones. A few anatomical differences between male and female brains have been observed in both rats and humans. In the hypothalamus of the brain, there are cell bodies called nuclei. In rats and in humans, these nuclei are larger in males than in females.

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