Hair chest is the hair that grows on the human human chest in the area between the neck and stomach. Hair chest develops during and after puberty along with other androgenic hair types.
Video Chest hair
Development and growth
Although vellus hair is present in the area during childhood, chest hair is a terminal hair that develops as an effect of increased androgen levels (especially testosterone and its derivatives) due to puberty. Different from head hair because it is a secondary sexual characteristic. Men tend to be covered with much more terminal hair, especially in the chest, abdomen, and face.
The development of chest hair begins normally during late puberty, usually between the ages of 12 and 18 years. It can also start later, between the ages of 20 and 30, so many men in their twenties have not yet achieved the development of their full chest hair. Growth continues.
Maps Chest hair
Pattern and characteristics
Individual events and chest hair characteristics depend on the genetic disposition, hormonal status and age of the person. Genes primarily determine the number, pattern and thickness of chest hair. Some men are very hairy, while others do not have chest hair at all. All ranges and patterns of normal hair growth. The areas in which terminal hairs can grow are periareolar areas (nipples), centers and chest sides and clavicle bone clavicle.
The direction of hair growth can create an interesting pattern, similar to the depiction of the field of mathematical vectors. A typical male will show a knot in the upper sternum, the upper hair that leads upward and the underside of the hair that leads down. Some individuals have a spiral above their pectoral area (a few inches from nipple to neck) that runs clockwise in the left breast. and counterclockwise on the right.
Consider the occurrence of individual chest hair as abnormal usually not because of medical indications but mainly for cultural and social attitudes. The excessive growth of terminal hair in the male and female body is called hypertrichosis. This medical term should be distinguished from hirsutism that affects only women. These women can develop terminal hairs on the chest following the male pattern as a symptom of endocrine disease.
Setty Pattern
Sometimes there are studies documenting the pattern of chest hair in men and the occurrence of these patterns. A large study of 1,400 white men aged 17 to 71 conducted by L.R. Setty in the 1960s defined 15 chest hair patterns. In this study, four chest regions in which terminal hair occurred were identified:
Haircuts can occur in each field independent of the others, making a total of 15 combinations next to the apilose (bare) pattern. Hair is said to occur in the pectoral and circumareolar areas when there is hair around the nipple and on the breast, but this area is not connected.
Pecto-sterno-infraclavicular pattern , in which the breast, breastbone and medial end of the clavicle are covered with terminal hair, most commonly (57%).
Example pattern
See also
- Hair
- Stomach hair
References
Further reading
-
Setty, LR (1961). "Naked area in chest and abdominal pilosity". Journal of National Medical Association . 53 (4): 394-5. PMCÃ, 2641808 . PMIDÃ, 13750402.
- Lookingbill, DP; Demers, LM; Wang, C; Leung, A; Rittmaster, RS; Santen, RJ (1991). "Clinical and biochemical parameters of androgen action on normal and healthy Chinese Caucasian subjects". Journal of Clinical Endocrinology and Metabolism . 72 (6): 1242-8. doi: 10.1210/jcem-72-6-1242. PMID 1827450.
Source of the article : Wikipedia
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