<Tr> <Td> Popliteal lymph nodes </Td> <Td> </Td> </Tr> <P> Male sex hormones are secreted by the testes later in embryonic life to cause the development of secondary sex organs . The scrotum is developmentally homologous to the labia minora and labia majora . The raphe does not exist in females . Reproductive organs and tissues develop in females and males begin during the fifth week after fertilization . The gonadal ridge grows behind the peritoneal membrane . By the sixth week, string - like tissues called primary sex cords form within the enlarging gonadal ridge . Externally, a swelling called the genital tubercule appears over the cloacal membrane . </P> <P> Up until the eighth week after fertilization, the reproductive organs do not appear to be different between the male and female and are called in - differentiated . Testosterone secretion starts during week eight, reaches peak levels during week 13 and eventually declines to very low levels by the end of the second trimester . The testosterone causes the masculinization of the labioscrotal folds into the scrotum . The scrotal raphe is formed when the embryonic, urethral groove closes by week 12 . </P> <P> One testis is typically lower than the other, which is believed to function to avoid compression in the event of impact; in humans, the left testis is typically lower than the right . An alternative view is that testis descent asymmetry evolved to enable more effective cooling of the testicles . </P>

When is the scrotum formed in the male
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