Skin goes to chicken when the cold surprises. Thats when human skin looks, at least in the arms, for a while, bare chicken skin. Chicken meat can also be caused by intense emotional turmoil or threat.

If youve ever wondered why your skin rises to chicken and when, youre in good company. The same thing was pondered by the doctrine of evolution Charles Darwin already in the 19th century.

According to the current interpretation, the change in the fine coat of the skin is a remnant of a time when a person had a comprehensive and thicker coat. As the hairs rose upright, they gathered air beneath them. The air helped as thermal insulation.

Now it has been found that a similar phenomenon also regulates hair growth. The same muscle that makes the skin hair upright on the scalp is necessary for a nerve connection to the stem cells of the hair-producing hair follicles at the root of the hair.

On the skin, the sympathetic nervous system reacts to the cold. It makes the small muscles of the skin move back and forth. On the scalp, the same muscle contraction and expansion produces more hair.

In this way, the cells that produce chicken meat also regulate hair growth and regeneration, say Harvard. university researchers in their research bulletin.

This was found in experiments on mice. The results were told scientific journal Cell.

On the skin, the muscle of the hair follicle (pink) contracts and lifts the chicken to the skin. But in the hair, the sympathetic nervous system (in green) releases neurotransmitters that target the hair follicle stem cells (in blue). They are activated and increase hair growth. Picture: Shwartz, Gonzalez-Celeiro, Chen, et al. / Cell

Skin is a fascinating body. It affects several stem cells surrounded by different cell types. At the same time, it is located at the interface between our body and the outside world, he says Ya-Chieh Hsu.

Indeed, stem cells can respond to many stimuli that come to the skin from the external environment or come from the skin itself, says Hsu.

He is an assistant professor of stem cell research and regenerative biology at Harvard University. Hsu studied hair cells by a professor at Taiwan National University Sung-Jan Linin with.

bodies there are often three types of tissues: superficial tissue, primitive tissue, and nerve tissue. On the skin, these three are specially arranged.

On the skin, the sympathetic nervous system controls the bodys homeostasis, ie the state of internal balance. It responds to external stimuli and connects to small smooth muscles in the elemental scaffold. The same smooth muscle also connects the hair follicles to the stem cells.

sympathetic the connection between nerve and muscle has been known for a long time. Cold triggers nerve cells in the sympathetic nervous system and send a signal. The muscles respond to it by contracting. It lifts the skin hair upright.

Hair follicle in the image of a microscope. Parts of the sympathetic nervous system are stained green and muscle cells reddish. Picture: Hsu Laboratory / Harvard University

Using an electron microscope, the researchers found that the sympathetic nerve was not just associated with the muscle. It also formed a direct connection to the stem cells of the hair follicles.

Nerve tissue wrapped around the stem cells of the hair follicles like a ribbon. It allows the nerve and the stem cell to interact with each other.

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