Changes

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At this stage of development the gonads do not have their own excretory ducts. In males the excretory ducts from the developing kidney, the '''Wolfian Ducts''' facilitate the excretion of spermatozoa away from the testes. These Wolfian Ducts develop into male accessory reproductive structures that include the epididymis and spermatic ducts aswell as connecting the developing testes where they connect a system of tubules, the ''rete testis''. These tubular connections collect spermatozoa from the seminiferous tubules resulting in a continuous tube system that facilitates the transport of spermatozoa to the external environment.

At this stage of development the gonads do not have their own excretory ducts. In males the excretory ducts from the developing kidney, the '''Wolfian Ducts''' facilitate the excretion of spermatozoa away from the testes. These Wolfian Ducts develop into male accessory reproductive structures that include the epididymis and spermatic ducts aswell as connecting the developing testes where they connect a system of tubules, the ''rete testis''. These tubular connections collect spermatozoa from the seminiferous tubules resulting in a continuous tube system that facilitates the transport of spermatozoa to the external environment. In females the Wolfian ducts undergo regression at this stage of development.

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In females

In both sexes a pair of '''Mullerian ducts''' are formed which are epithelialised ducts which extend from the lumbar region to the urogenital cleft. In females, the fallopian tubes or [[Oviduct_-_Anatomy_%26_Physiology|oviducts]], [[Uterus_-_Anatomy_%26_Physiology|uterus]] and internal elements of the vagina all develop from these ducts. Although the Mullerian ducts are formed in males, they eventually regress.

===Secondary Sexual Differentiation Phase===

===Secondary Sexual Differentiation Phase===