The initial appearance of the fetal genitalia looks basically feminine: Between the labia majora are the labia minora, two folds of skin that also extend down from the clitoris and around the vaginal opening. Intersex is the development of genitalia somewhere between typical male and female genitalia. These vary in size from woman to woman. Each sex organ in one sex has a homologous counterpart in the other one. The labia majora and the perineum are covered with skin similar to that on the rest of the body. The labia minora literally, small lips can be very small or up to 2 inches wide. Collectively, these parts are called the vulva.
Excretory systems with analogous purpose in certain invertebrates are also sometimes referred to as cloacae. The vagina is a muscular tube about three to four inches long that ends the birth canal. The mons pubis contains oil-secreting sebaceous glands that release substances that are involved in sexual attraction pheromones. It varies in length from almost 1 to more than 2 inches 2 to 5 centimeters. A rich supply of blood vessels gives the labia minora a pink color. In a larger perspective, the whole process of sexual differentiation also includes development of secondary sexual characteristics such as patterns of pubic and facial hair and female breasts that emerge at puberty. Thereafter, the development of the internal, and external reproductive organs is determined by hormones produced by certain fetal gonads ovaries or testes and the cells' response to them. This is also known as the pudendal cleft or the cleft of Venus, after the Roman goddess of love. When stimulated, Bartholin glands located beside the vaginal opening secrete a thick fluid that supplies lubrication for intercourse. Most women cannot achieve orgasm without direct stimulation to the clitoris. Rich with nerves, the vulva can provide sexual pleasure when properly stimulated. These vary in size from woman to woman. If they pick the wrong one, their child may begin to show symptoms of transsexualism , which can lead them to a life of discomfort until they are able to remedy the issue. The area containing these organs is called the vulva. The vaginal opening is the entryway for the penis during sexual intercourse and the exit for blood during menstruation and for the baby during birth. The shaft under the skin has erectile tissue, which becomes engorged with increased blood flow. The outer surfaces of the folds have darker-colored skin and stronger hairs, while the inner folds are smoother. The clitoris is a very sensitive area when stimulated. See a list of homologues of the human reproductive system. Furthermore, differences in brain structure arise, affecting, but not absolutely determining, behavior. Development of the reproductive system In typical prenatal development , sex organs originate from a common primordium during early gestation and differentiate into male or female sexes. The opening to the urethra, which carries urine from the bladder to the outside, is located above and in front of the vaginal opening. The labia majora contain sweat and sebaceous glands, which produce lubricating secretions. The labia majora and the perineum are covered with skin similar to that on the rest of the body. Other animals[ edit ] In many other animals a single posterior orifice, called the cloaca , serves as the only opening for the reproductive, digestive, and urinary tracts if present.
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