The growth of a boy's penis can be influenced by several factors, including genetics, nutrition, hormones, and the environment. The average thickness of the penis in mature men is typically 1 inch (approximately 2.54 centimeters). However, the size of a boy's penis can vary widely from person to person and is not accurately reflected by his age.
Penile Growth Curves and Charts
Although there are some general trends in penile growth, there is considerable variation among individuals.Penile growth is divided into several stages, including early青春期前期,青春期后期和成年期。在青春期生长迅速，生长速率约为0.8厘米（大约3.15英寸）每年。成年后，生长的速度会减慢，平均每年生长约0.4至0.5厘米（约1.5至2英寸）。因此，正常情况下，一个成熟男性的阴茎会生长到大约6至9厘米（2.7至3.5英寸）的长度。
Penile growth is closely related to testicular volume. For example, the size of Testes in 3 to 12 month-old boys is 3.5-6 cm³. The average testicular volume is ≥8 mL during the second quarter of adolescence. The increase in Testis volume is due to the filling of testicular fluid and is a sign that the boy is approaching adolescence.
Impact of Environment
Some studies suggest that environmental factors, such as phthalates and polyfluorinated aromatic compounds(PFAs), may affect penile growth. For example, studies on male rats have shown that phthalate exposure from in-utero and early-life exposure is associated with a reduction in testicular volume and penile length.
While some factors clearly impact penile growth, the size of a boy's penis is primarily influenced by hormones, mainly testosterone, which is secreted during puberty. Testosterone levels are influenced by the HPG-axis and can increase with puberty. The HPG-axis is transiently active during the first month after birth, before puberty.
Determining Testicular Volume
Use the following formula to determine testicular volume: Testicular volume = (length × width × height) × π (where length, width, and height are measurements in cm).
Understanding Testicular Volume
Testicular volume reflects testicular function, and testicular function is crucial for fertility. Testicular volume varies with age and nutritional status. Therefore, determining whether testicular volume is within the normal range is an important indicator of the boy's reproductive health and the need for further testing.
Testicular volume is crucial in predicting the future development of boy's reproductive system. Monitoring and evaluating testicular volume has become an essential part of urological follow-up of boys.
It is important to note that the growth chart of boy's penis should be used as a reference only and should not be used as the only criterion for assessing a boy's Reproductive health. The size and shape of Testes can also affect sexual function. Therefore, regular physical examinations and tests are necessary to ensure the health of boys.
References
- PubMed 28945045
- PubMed 29124579
- PubMed 27272046
- PubMed 27356466
- PubMed 11593167
- PubMed 28774364
- PubMed 25984172
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