Why do men have nipples?
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While SNS regulates images of women's nipples, it does not regulate images of men's nipples, so only the nipples of nude women can be replaced with photos of men's nipples, or men and women's nipples can be alternated Numerous protests are taking place, such as the creation of an Instagram account that posts and challenges regulations. However, Michel Moskova, a lecturer at the University of New South Wales, answers the question of why men who are not breastfeeding have nipples in the first place.
Why do men have nipples?
https://theconversation.com/why-do-men-have-nipples-120893
Fetuses in the very early stages of development have a structure that can be developed in both the female and male genital organs. When the fetus is about 7 weeks old and the SRY gene, which determines the sex of the embryo in males, has inherited the Y chromosome, undifferentiated gonads are induced into the testis. On the other hand, individuals who do not have the Y chromosome develop the female genital organs and the male genital tract disappears.
However, breasts and nipples begin to be made 4-6 weeks before SRY begins. During this period, the nipples and mammary glands grow from the armpit to the crotch.
When the fetus develops into a male due to the expression of SRY, most of the teat disappears, but the cells that make up the muscles around the primitive nipple and areola remain. This will eventually become the man's chest and nipples.
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For some time after birth, boys and girls have similar breasts, but as they grow, the nipples of women change much more than the nipples of men due to hormonal effects. At this time, the female milk duct becomes larger, while the male breast duct becomes smaller, and as an adult, the male nipple is smaller than the female and remains unchanged.
According to one theory, it was said that the male nipples remained in the process of evolution did not have any merits and no harm. In other words, it remained because there was no merit even if it was removed.
However, reports such as breast milk comes out when you recover from an imbalance, or the treatment of hunger and hormones in men has risen . Research has shown that even men who do not benefit from breastfeeding can generally receive sexual stimulation from their nipples.
It has also been reported that when the fetal development is unsuccessful, there is an extra nipple on the body. The survey shows that 1 in 20 people have an extra nipple that looks like a mole, and the most extra nipple reported so far is seven .
Although male nipples do not function normally, Moskova is calling for attention that men can also develop breast cancer. Male breast cancer accounts for 0.5 to 1% of all breast cancer, but it is rare, so it is easily overlooked and discovery is likely to be delayed. Even if a man feels that his chest has changed or is a lump, Moskova said that a doctor should be consulted.
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