Man sex organs
Secondary sex organs refer the rest of the reproductive system, whether internal or external. The Latin term genitaliasometimes anglicized as genitalsis used to describe the externally visible sex organs: in male mammals, the penis and scrotum ; and in female mammals, the vulva and its organs.
In general zoology, given the great variety in organs, physiologies, and behaviors involved in copulationmale genitalia are more strictly defined as "all male structures that are inserted in the female or that hold her near her gonopore during sperm transfer"; female genitalia are defined as "those parts of the female reproductive tract that make direct contact with male genitalia or male products sperm, spermatophores during or immediately after copulation".
The visible portion of the mammalian genitals for males consists of the scrotum and penis ; for females, it consists of the vulva labiaclitorisetc. In placental mammalsfemales have two genital orifices, the vagina and urethra, while males have only one, the urethra.
How a man's body works
In typical prenatal developmentsex organs originate from a common primordium during early gestation and differentiate into male or female sexes. The SRY geneusually located on the Y chromosome and encoding the testis determining factordetermines the direction of this differentiation. The absence of it allows the gonads to continue to develop into ovaries.
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.
The male sex organs. A man's genitals and sex organs are in the pelvis (the lower part of the belly) and in the front of the body between the legs. Here are some of the organs in or near the pelvis, including sex organs and other nearby organs. Cancer of any of these organs or cancer treatment in this area can affect your sex life. Jan 21, 12 People With Seriously Strange Sex Organs. Posted on January 21, January 22, by Jill Harness. Category: Even so, it is rare for a person to carry fully functional reproductive organs. One year-old British man (who goes by "Rob") was shocked when doctors told him he has fully-functional female reproductive organs. While Rob. Apr 08, Watch video Gay pornography men sex organs movies first on Redtube, home of free Bondage porn videos and Gay sex movies online. Video length: - Starring: Hot amateurs gone wild in this 3D, Anal Sex video.
The initial appearance of the fetal genitalia looks basically feminine: a pair of " urogenital folds " with a small protuberance in the middle, and the urethra behind the protuberance. If the fetus has testes, and if the testes produce testosterone, and if the cells of the genitals respond to the testosterone, the outer urogenital folds swell and fuse in the midline to produce the scrotum; the protuberance grows larger and straighter to form the penis; the inner urogenital swellings grow, wrap around the penis, and fuse in the midline to form the penile urethra.
Each sex organ in one sex has a homologous counterpart in the other one. See a list of homologues of the human reproductive system. 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.
Furthermore, differences in brain structure arise, affecting, but not absolutely determining, behavior.
Ultrasound Training of the Female Reproductive Organs
Intersex is the development of genitalia somewhere between typical male and female genitalia. Once the child is born, the parents are faced with decisions that are often difficult to make, such as whether or not to modify the genitalia, assign the child as male or femaleor leave the genitalia as is. Some parents allow their doctors to choose. If they pick the wrong one, their child may begin to show symptoms of transsexualismwhich can lead them to a life of discomfort until they are able to remedy the issue.
Because of the strong sexual selection affecting the structure and function of genitalia, they form an organ system that evolves rapidly.
In many other animals a single posterior orifice, called the cloacaserves as the only opening for the reproductive, digestive, and urinary tracts if present. All amphibians, birds, reptiles, some fish, and a few mammals monotremes, tenrecs, golden moles, and marsupial moles have this orifice, from which they excrete both urine and feces in addition to serving reproductive functions.
Excretory systems with analogous purpose in certain invertebrates are also sometimes referred to as cloacae. The organs concerned with insect mating and the deposition of eggs are known collectively as the external genitalia, although they may be largely internal; their components are very diverse in form.
The reproductive system of gastropods slugs and snails varies greatly from one group to another.
12 People With Seriously Strange Sex Organs
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Humans are sexual, meaning that both a male and a female are needed to reproduce. Each is equipped with specific organs capable of producing specific cells needed to procreate. In conjunction with. Mar 19, The vagina is a muscular tube about three to four inches long that ends the birth naturalhealthnwellness.com is where a man's penis enters the woman during sexual intercourse. The vaginal opening is . From the outside, the male has two visible sex organs, the testes (or testicles) and penis. The testes are the primary male sexual organs in that they make sperm and produce testosterone. The sperm is the male sex cell, or gamete, and each testicle produces more than 4 million new sperm per hour [source: Angier]. Testosterone is the hormone.
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Sperm, which are often compared to tadpoles in appearance, use their tails to travel, while the head contains the genetic material. The penis is made of soft, spongy tissue that can expand or contract. When a man becomes sexually aroused, the penis becomes engorged with bloodcausing the spongy tissues to stiffen and the penis to become erect.
This erect state makes it easy to place the penis inside a woman's vagina during sexual intercourse. During sex, the male reproductive system is still at work, equipping the sperm with the assistance they will need to fertilize an egg.