You lost me at "quote indicators" before - I was just playing along. My fingers are FING-ing...
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The numbers tell you where to learn
On entering
puberty, the penis,
scrotum and
testicles will begin to develop. During the process,
pubic hair grows above and around the penis. A large-scale study assessing penis size in thousands of 17–19 year old males found no difference in average penis size between 17 year olds and 19 year olds. From this, it can be concluded that penile growth is typically complete not later than age 17, and possibly earlier.
[1]
Physiological functions
Urination
Main article:
Urination
In males, the expulsion of
urine from the body is done through the penis. The
urethra drains the bladder through the
prostate gland where it is joined by the
ejaculatory duct, and then onward to the penis. At the root of the penis (the proximal end of the corpus spongiosum) lies the
external sphincter muscle. This is a small sphincter of
striated muscle tissue and is in healthy males under voluntary control. Relaxing the urethra sphincter allows the urine in the upper urethra to enter the penis proper and thus empty the urinary bladder.
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Man urinating in a public toilet
Physiologically, urination involves coordination between the
central,
autonomic, and
somatic nervous systems. In infants, some elderly individuals, and those with neurological injury, urination may occur as an involuntary
reflex. Brain centers that regulate urination include the
pontine micturition center,
periaqueductal gray, and the
cerebral cortex.
[2] During erection, these centers block the relaxation of the sphincter muscles, so as to act as a physiological separation of the excretory and reproductive function of the penis, and stopping sperm from entering the upper portion of the urethra during ejaculation.
[3]
- Ponchietti R, Mondaini N, Bonafè M, Di Loro F, Biscioni S, Masieri L (February 2001). "Penile length and circumference: a study on 3,300 young Italian males". European Urology 39 (2): 183–6. doi:10.1159/000052434. PMID 11223678.
- Sie JA, Blok BF, de Weerd H, Holstege G (2001). "Ultrastructural evidence for direct projections from the pontine micturition center to glycine-immunoreactive neurons in the sacral dorsal gray commissure in the cat". J. Comp. Neurol. 429 (4): 631–7. doi:10.1002/1096-9861(20010122)429:4<631::AID-CNE9>3.0.CO;2-M. PMID 11135240.
- Schirren, C.; Rehacek, M.; Cooman, S. de; Widmann, H.-U. (24 April 2009). "Die retrograde Ejakulation". Andrologia 5 (1): 7–14. doi:10.1111/j.1439-0272.1973.tb00878.x.
See