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The Tanner scale remains the gold standard for determining pubarche. In clinical settings, this scale is primarily used by physicians, nurses, or other trained healthcare providers as part of a physical examination to assess the stage of puberty in children and adolescents, though in some cases the stage of puberty can be self-assessed. [4]
The Tanner scale (also known as the Tanner stages or sexual maturity rating (SMR)) is a scale of physical development as pre-pubescent children transition into adolescence, and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics , such as the size of the breasts ...
Tanner Scale of female breast development Thelarche , also known as breast budding, is the onset of secondary breast development , often representing the beginning of pubertal development. [ 1 ] It is the stage at which male and female breasts differentiate due to variance in hormone levels; however, some males have a condition in which they ...
It is referred to as pubarche. The pubic hairs are usually visible first along the labia. The first few hairs are described as Tanner stage 2. [52] Stage 3 is usually reached within another 6–12 months, when the hairs are too numerous to count and appear on the pubic mound as well. By stage 4, the pubic hairs densely fill the "pubic triangle".
In males, gonadarche is determined with testicular volume greater than 3 mL, genital stage greater than or equal to 2, or pubarche, which is defined as pubic hair stage greater than or equal to 2. If testicular volumes of the 2 testes are not equal, the larger testis measurement is used.
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The human Y chromosome showing the SRY gene which codes for a protein regulating sexual differentiation. Sexual differentiation in humans is the process of development of sex differences in humans.
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.