In this region, the superficial layer of the epidermis is very thin and smoother than in the rest of the body, so it must be very well protected against ultraviolet radiation . Therefore, it is dyed with greater intensity. Melanocytes, the melanin-producing cells found in the epidermis, are responsible for this.
The areola of the nipple is darker, why?
Did you know that eyes are an example of evolution?
According to followers of intelligent design, the eye is an example of irreducible complexity, but the reality is very different.
Morris syndrome: women with testicles
Nature likes diversity, and in humans, sex is far from being the binary variable that many believe it to be.
The most horrendous side of the human being
The social sciences have shown with a series of experiments the most horrendous, primitive and sickly side of human nature.
Discover the life that hides under your nails
Our body has as many microorganisms as cells, and some hide in the most remote places.
They find the oldest heart in history (it is 380 million years old)
The fossil corresponds to an ancient jawed fish. Its structure sheds light on the evolution of the human body.