Chest hair


Chest hair
Growth and Patterns of Chest Hair

The term chest hair is generally used to describe hair that grows on the chest of human males, in the region between the neck and the abdomen. Chest hair, which is a secondary sex characteristic, develops during and after puberty. It is therefore part of the androgenic hair.

Contents

Development and growth

Although vellus hair is already present in the area in childhood, the term chest hair is generally restricted to the terminal hair that develops as an effect of rising levels of androgens (primarily testosterone and its derivatives) due to puberty. Different from the head hair it is therefore a secondary sexual characteristic. Men tend to be covered with far more terminal hair, particularly on the chest, the abdomen and the face.

The development of chest hair begins normally during late puberty, usually between the ages of 15 and 18. It can also start later, between the age of 20 and 30, so that many men in their twenties have not yet reached their full chest hair development. The growth continues subsequently. In older adult years androgens cause thickening of the hair.

Patterns and characteristics

Pattern 1 - Chest hair primarily between pecs and around the nipples
Pattern 3 - Abdominal hair separate from chest hair
Pattern 4 - Abdominal hair connects to chest hair

The individual occurrence and characteristics of chest hair depend on the genetic disposition, the hormonal status and the age of the person. The genes primarily determine the amount, patterns and thickness of chest hair. Some men are very hairy, while others have no chest hair at all. All ranges and patterns of hair growth are normal. The areas where terminal hair may grow are the periareolar areas (nipples), the centre and sides of the chest and the clavicle (collarbone).

The direction of growth of hair can make for interesting patterns, akin to depictions of mathematical vector fields. Typical males will exhibit a node on the upper sternum, the hair above which points up and the hair below which points down. Some individuals (of, say, the pattern in diagram 3) have spirals on their upper pectoral regions (several inches from the nipple towards the neck) which run clockwise on the left breast and counter-clockwise on the right.

Considering an individual occurrence of chest hair as abnormal is usually not due to medical indications but primarily to cultural and social attitudes. An excessive growth of terminal hair on the body of men and women is called hypertrichosis. This medical term has to be distinguished from hirsutism that just affects women. These women can develop terminal hair on the chest following the male pattern as a symptom of an endocrine disease.

There have been occasional studies documenting patterns of chest hair in men and occurrence of these patterns. A study of 1100 men aged 17 to 71 defined and documented ten patterns of chest hair in Caucasoid men. In this study 6 percent of the men were found to have no chest hair. The largest group, 56 percent, displayed pattern four as shown in the accompanying figure. The remaining 38 percent of the men displayed a lesser quantity of chest hair. Seven percent displayed pattern one, 13 percent displayed pattern two and 18 percent displayed various other patterns.[citation needed]

The same study documented the chest hair patterns of 60 African-American men aged 20-40. For these men 22 percent were found to have no chest hair. The largest group, 37 percent displayed pattern four and the remaining 41 percent had a lesser quantity of chest hair. Eight percent displayed pattern one, 12 percent pattern two and 11 percent displayed various other patterns.[1][2]

See also

References

  1. ^ Setty, LR (1961). "The distribution of chest hair in Caucasoid males". American journal of physical anthropology 19: 285–7. doi:10.1002/ajpa.1330190309. PMID 13910982. 
  2. ^ Setty, LR (1962). "The sterno-infraclavicular chest hair pattern". Journal of the National Medical Association 54: 486–7. PMC 2642315. PMID 13910983. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2642315. 

Further reading


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Hair removal — For hair loss, see Alopecia. Not to be confused with Unhairing. Sample distribution of body hair in women and men …   Wikipedia

  • Hair Kingdom villains — This is an article about the Hair Kingdom, from the manga/anime series Bobobo bo Bo bobo by Yoshio Sawai. The home country of several characters, including main character Bo bobo and key warrior Hatenko, it is also the final destination of the… …   Wikipedia

  • Chest — This article is about the anatomical term. For other uses, see Chest (disambiguation). Chest Chest anatomy …   Wikipedia

  • hair — I (New American Roget s College Thesaurus) I n. mane (see hair); filament;bit, inch (see narrowness, nearness). II Body covering filament Nouns 1. hair; head of hair, mop, mane, crop of hair, thatch, shock; gray, silver or white hair (see… …   English dictionary for students

  • Hair transplantation — is a surgical technique that involves moving skin containing hair follicles from one part of the body (the donor site) to bald or balding parts (the recipient site). It is primarily used to treat male pattern baldness, whereby grafts containing… …   Wikipedia

  • Hair disease — Classification and external resources Hair follicle ICD 10 L63 …   Wikipedia

  • Chest of Saint Simeon — The Silver Chest of Saint Simeon A replica of the chest as seen in the Croatian Academy of Sciences and Arts. Under protection of UNESCO Description Author: Date: Place …   Wikipedia

  • Hair — For other uses, see Hair (disambiguation). Hairy redirects here. For individuals nicknamed the Hairy , see List of people known as the Hairy. Hair Cross section of a hair Latin unguis …   Wikipedia

  • Hair (musical) — Infobox Musical name = Hair subtitle = The American Tribal Love Rock Musical caption = Original Broadway poster music = Galt MacDermot lyrics = James Rado Gerome Ragni book = James Rado Gerome Ragni basis = productions = 1967 Off Broadway 1968… …   Wikipedia

  • chest — noun ADJECTIVE ▪ barrel, big, broad, huge, manly, massive, muscled, muscular, powerful, strong ▪ …   Collocations dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.