Animals that move at a steady pace — such as elephants , whales , and marsupial moles — have internal testes and no scrotum. The external scrotum is not affected by abdominal pressure. What does the male reproductive system do? The scrotal raphe is formed when the embryonic, urethral groove closes by week Several different organs and structures make up the male reproductive system. It is divided into two, and each side contains one testicle testis. The bulbourethral glands The penis. About two months before a male baby is born, the testes start to drop down into the scrotal sacs.
The scrotum, or scrotal sac. It is divided into two, and each side contains one testicle testis. The scrotal raphe is formed when the embryonic, urethral groove closes by week The testosterone causes the masculinization of the labioscrotal folds into the scrotum. The scrotum is developmentally homologous to the labia minora and labia majora. The increased secretion of testosterone causes the darkening of the skin and development of pubic hair on the scrotum. The raphe does not exist in females. It carries both urine and semen. Enlargement of the penis. It may also be called the sperm duct. The main function is to give men the ability to fertilise a woman's egg ovum by producing and delivering semen. Because they are outside the main body cavity the testes are slightly cooler. There are two testes. This then opens into the urethra, which is the tube that takes the sperm outside the body. The three glands are located close to the bladder and are called: The testicles testes also make hormones which help men develop the characteristics associated with being male. This is the loose bag of skin which hangs under the main body cavity between the upper thighs. By the sixth week, string-like tissues called primary sex cords form within the enlarging gonadal ridge. It meets a tube from the seminal vesicle see below to form a short tube called the ejaculatory duct. Higher temperatures affect spermatogenesis  Temperature control is accomplished by the smooth muscles of the scrotum moving the testicles either closer to or further away from the abdomen dependent upon the ambient temperature. The testes start developing inside the body cavity in a growing baby fetus. Externally, a swelling called the genital tubercule appears over the cloacal membrane. What does the male reproductive system do? The bulbourethral glands The penis. Semen is the liquid which is ejected from the penis during ejaculation.
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