What is the reason that always has goose bumps on the body? When people watch horror movies, they often feel alarmed, shivering and goosebumps all over. In fact, this is caused by the contraction of the erector muscle.
Erector muscle is a kind of smooth muscle related to hair follicle. It is composed of slender spindle muscle fiber bundles. One end of the bundle starts from the papillary layer of the dermis and inserts into the connective tissue sheath on the middle side of the hair follicle to form an obtuse angle with the skin. Therefore, when the erector muscle contracts, the hair will stand upright on the skin, and the spindle muscle cells will become elastin fibers at both the beginning and the end. The latter will insert into the gap between the muscle cells and be fixed, The tendon junction was formed. When the muscle relaxes, due to the elastic repositioning of the surrounding dermis, the hair returns to its original position, and the elastic hard protein fibers around the outer hair root sheath firmly adhere to the epidermal cells. In fact, it has less elasticity and greater tension. The end of the muscle is inserted into the stiff hair follicle, but the beginning under the epidermis is not stiff, so when the erector muscle contracts, the skin is twisted to produce a chicken skin like appearance.
The activity of erector muscle is controlled by adrenergic sympathetic nerve. When fear, fear and other mental emotional changes occur, the sympathetic nerve is excited, the level of epinephrine increases, the erector muscle contracts, and the hair is erect, which is the so-called hair rash and goose bumps.
After reading the above content, you should know something about the reason why you always get goose bumps. More about the topic of goose bumps, Sihai Xiaobian will continue to introduce it in the following article. Welcome to check. Wish you a happy life!