Which gland is found only in males

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These steroid hormones contribute to the development and function of the female reproductive organs and sex characteristics. At the onset of puberty, estrogens promotes:. Progesterone causes the uterine lining to thicken in preparation for pregnancy. The accessory glands of the male reproductive system are the seminal vesicles , prostate gland , and the bulbourethral glands.

These glands secrete fluids that enter the urethra. The paired seminal vesicles are saccular glands posterior to the urinary bladder. Each gland has a short duct that joins with the ductus deferens at the ampulla to form an ejaculatory duct , which then empties into the urethra. The fluid from the seminal vesicles is viscous and contains fructose , which provides an energy source for the sperm; prostaglandins, which contribute to the mobility and viability of the sperm; and proteins that cause slight coagulation reactions in the semen after ejaculation.

The prostate gland is a firm, dense structure that is located just inferior to the urinary bladder. It is about the size of a walnut and encircles the urethra as it leaves the urinary bladder.