Pubarch
Under pubarche ( lat. - give a wiki. : From lat. Pub / pubes for " female genitalia, pubic hair ," and give a wiki. Ark for " beginning " or " origin ") is defined as the beginning of a rule even before puberty under Effect of the increasing production of sex hormones occurring, slow and continuous development of female and male pubic hair . This term is often not understood to be a precise point in time, but a first period of time or a first process at the beginning of a long-term development.
physiology
General
Nowadays, in a healthy, well-nourished human body , the hormonal changes that underlie puberty usually begin at the age of eight or nine . There is a slow increase in body size , as more growth hormones and thyroxine are released. At the same time, sexual maturation is triggered and promoted through the production of sex hormones . Both estrogens and androgens such as testosterone occur in the male and female body, but in different amounts. Estrogens are considered female and androgens are considered male sex hormones.
Boys
As the gonadotropin concentration in the blood rises, boys' testosterone production in the Leydig cells between the testes increases well before puberty itself . This male sex hormone shapes the secondary sexual characteristics and is therefore responsible, among other things, for the onset of pubic and armpit hair and, in the course of puberty, for the developing body hair such as beard hair and chest hair .
girl
In girls , too, the hormonal changes that underlie sexual maturation and thus puberty generally begin at the age of eight or nine . Even with them, well before the onset of actual puberty, there is a continuously increasing production of both primarily female, but also male sex hormones. The androgens produced in the female adrenal glands then influence the girls' growth in length and also stimulate the growth of the armpit and pubic hair in particular .
Stages of development
According to James M. Tanner , six stages are distinguished in the overall development of female pubic hair:
- P1: no hair
- P2: little pubic hair on the labia majora
- P3: strong hairs of circumscribed extent
- P4: adult hair, but less extensive
- P5: normal adult hair, sharply delimited horizontally above
- P6: hair rising to the navel and extending over the thighs: pathological
See also
literature
- Wolf D. Keidel: Brief textbook of physiology. 2nd edition, Thieme, Stuttgart 1970.
- Erwin J. Haeberle : The sexuality of humans. de Gruyter, Berlin / New York 1983, ISBN 3-11-008753-7 .
