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|Goose bumps on a human arm|
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Goose bumps, goose pimples or goose flesh are the bumps on a person's skin at the base of body hairs which may involuntarily develop when a person is cold or experiences strong emotions such as fear, euphoria or sexual arousal. The medical term for the effect is cutis anserina or horripilation.
The formation of goose bumps in humans under stress is considered by some to be a vestigial reflex; some[who?] believe its function in human ancestors was to raise the body's hair, making the ancestor appear larger to scare off predators. The reflex of producing goose bumps is known as arasing, piloerection, or the pilomotor reflex. It occurs in many mammals besides humans; a prominent example is porcupines, which raise their quills when threatened, or sea otters when they encounter sharks or other predators.
The phrase "goose bumps" derives from the phenomenon's association with goose skin. Goose feathers grow from stores in the epidermis which resemble human hair follicles. When a goose's feathers are plucked, its skin has protrusions where the feathers were, and these bumps are what the human phenomenon resembles.
It is not clear why the particular fowl, goose, was chosen in English, as most other birds share this same anatomical feature. Some authors have applied "goosebumps" to the symptoms of sexually-transmitted diseases. "Bitten by a Winchester goose" was a common euphemism for having contracted syphilis in the 16th century. "Winchester geese" was the nickname for the prostitutes of South London, licensed by the Bishop of Winchester in the area around his London palace.
This etymology does not explain why many other languages use the same bird as in English. "Goose skin" is used in German (Gänsehaut), Swedish (gåshud), Danish and Norwegian (gåsehud), Icelandic (gæsahúð), Greek (χήνειο δέρμα), Italian (pelle d'oca), Russian (гусиная кожа), Ukrainian (гусяча шкіра), Polish (gęsia skórka), Czech (husí kůže), Slovak (husia koža), Latvian (zosāda) and Hungarian (libabőr).
In other languages, the "goose" may be replaced by other kinds of poultry. For instance, "hen" is used in Spanish (piel de gallina), Portuguese (pele de galinha), Romanian (piele de găină), French (chair de poule), Catalan (pell de gallina), Slovene (kurja polt) and in Central Italy (ciccia di gallina)and in Northern Italy (pelle d'oca). "Chicken" is used in Dutch (kippenvel), Chinese (雞皮疙瘩, lit. lumps on chicken skin), Finnish (kananliha), Estonian (kananahk), Afrikaans (hoendervleis) and Korean (닭살, daksal). In Hindi/Urdu it is called rongtey khade ho jaana. The equivalent Japanese term, 鳥肌, torihada, translates literally as "bird skin". In Arabic it is called kash'arirah (قشعريرة), while in Hebrew it is called "duck skin" (עור ברווז). In Vietnamese, it is called da gà, which can be translated as "chicken skin", or gai ốc, which can be translated as "snail node".
All of the birds listed above are commonly consumed in the country of origin, so it may well be assumed that the term "goose pimples" (also "goose skin" and "goose flesh", c.1785 and 1810) and all other related terms in other languages came into being merely due to the visual similarity of the bird's plucked skin and the human skin phenomenon, used to describe the sensation in a way that is readily familiar.
The same effect is manifested in the root word "horror" in English, which is derived from Latin horrere, which means "to bristle", and "be horrified", because of the accompanying hair reaction.
Anatomy and biology
Goose bumps are created when tiny muscles at the base of each hair, known as arrector pili muscles, contract and pull the hair erect. The reflex is started by the sympathetic nervous system, which is responsible for many fight-or-flight responses.
As a response to cold: in animals covered with fur or hair, the erect hairs trap air to create a layer of insulation. Goose bumps can also be a response to anger or fear: the erect hairs make the animal appear larger, in order to intimidate enemies. This can be observed in the intimidation displays of chimpanzees, some New World monkeys like the cotton-top tamarin, in stressed mice and rats, and in frightened cats. In humans, it can even extend to piloerection as a reaction to hearing nails scratch on a chalkboard, listening to awe-inspiring music, or feeling or remembering strong and positive emotions (e.g., after winning a sports event, or while watching a horror film). Moreover, there are rare accounts of people who are able to deliberately evoke goose bumps in themselves without any external trigger. Goose bumps are accompanied by a specific physiological response pattern that is thought to indicate the emotional state of being moved. During the formation of goose bumps, the body is warmed from the muscle tension in piloerection.
In humans, goose bumps are strongest on the forearms, but also occur on the legs, neck, and other areas of the skin that have hair. In some people, they even occur in the face or on the head.
Piloerection is also a classic symptom of some diseases, such as temporal lobe epilepsy, some brain tumors, and autonomic hyperreflexia. Goose bumps can also be caused by withdrawal from opiates such as heroin. A skin condition that mimics goose bumps in appearance is keratosis pilaris.
Goose bumps can be experienced in the presence of cold temperatures. The stimulus of cold surroundings causes the tiny muscles attached to each hair follicle to contract. This contraction causes the hair strands to literally "stand on end." At the same time, the tiny muscles that are contracting are causing a "bunching" of the skin surrounding the hairs, which results in the "bumps" in goose bumps.
This is the body's way of attempting to preserve its own heat by causing the hairs on the skin to stand up, thus reducing heat loss. This is a mechanism observed in many mammals, whose raised fur helps to create a layer of warm air against the skin, contributing to the theory that goose bumps are a vestigial reflex. Goose bumps are often seen in conjunction with shivering in these instances.
People often say they feel their "hair standing on end" when they are frightened or in awe. In an extremely stressful situation, the body can employ the "fight or flight" response. As the body prepares itself for either fighting or running, the sympathetic nervous system floods the blood with adrenaline (epinephrine), a hormone that speeds up heart rate, metabolism, and body temperature in the presence of extreme stress. Then the sympathetic nervous system also causes the piloerection reflex, which makes the muscles attached to the base of each hair follicle contract and force the hair up.
Medications and herbal supplements that affect body temperature and blood flow may cause piloerection. For example, one of the common reported side effects of the intake of Yohimbine HCL is piloerection.
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