When the fingers are cut by paper, that pain is really pain. Some people say that pain is derived from the paper has a special chemical composition, but really is it
From a scientific point of view, the source of pain is based on the distribution of nerve endings at the fingertips, but the shallow wound will be more painful than the bleeding wound, why?
Everyone has always tried to be cut by the paper, really screamed. The original so painful, from the anatomical point of view a little knowledge, is based on the distribution of fingertips nerve endings, pain receptors are more.
Different parts of different pain - nerve endings are different distribution
Although the arms, heels, these positions are cut by the paper will be very painful, but compared with the pain of the fingers, is indeed very different, the difference comes from the distribution of nerve endings. Harley Goldbach, a dermatologist at the University of California, Los Angeles, also said, "It may be painful to think that the paper is over the face or genitals."
Different parts of the pain, but the number of receptors are different, Harley Goldbach that is the evolution of mankind, "we use your fingertips to explore the world, so fine work, so the tip of a large number of nerve endings distribution is very reasonable Is a security mechanism. "The brain will constantly monitor the potential threat to his hands, fingers feel painful to keep their hands in a safe state.
The edge of the paper is jagged
In addition to the anatomy of the reasons, but also because the wound more difficult to heal. Although the naked eye to see the paper seems to be smooth, but if you use a microscope to observe, you will find the edge of the paper is irregular jagged, so when the fingers were cut by paper, the wound is jagged, wound healing difficult.
Wound is not deep and difficult to coke
But also by the depth of the skin cut the skin, but also to deepen the pain of the fingertips. Harley Goldbach points out that the depth of the wound exceeds the epidermis, "if you only destroy the epidermis without the distribution of nerve endings, you will not feel pain."
However, this wound will not deep into the bleeding and "coke", and thus lack the mechanism to protect the wound healing, waiting for healing in the process, the nerve will continue to be exposed to the air, to withstand external stimuli, continue to send a warning message to the brain, Pain continues. Plus paper easy to make bacteria grow, when the paper cut the skin caused by the wound, fingertips will be susceptible to bacterial infection.
To avoid sustained pain, wash the wound with water, and then wrap the wound with a tape. If you want to block the wound with the air contact, you can also apply a little ointment.