Beg ar vronn : diforc'h etre ar stummoù

D
ortho, replaced: .<ref>M. Hussain, L. Rynn, C. Riordan and P. J. Regan, Nipple-areola reconstruction: outcome assessment; European Journal of Plastic Surgery, Vol. 26, Num. 7, December, 2003</ref>. → <ref>M. Hussain, L. R using AWB
D (ortho, replaced: .<ref>M. Hussain, L. Rynn, C. Riordan and P. J. Regan, Nipple-areola reconstruction: outcome assessment; European Journal of Plastic Surgery, Vol. 26, Num. 7, December, 2003</ref>. → <ref>M. Hussain, L. R using AWB)
[[Restr:Brustwarze.jpg|thumb|200px|Beg-bronn gwaz, stegnet e-kreiz ar blev.]]
[[Restr:20060726_supernumerary_nipples_torso_w_text.png|thumb|200px|Begoù-bronnoù dreist-kont. A - Dreist-kont. B - Ordinal. C - Dreist-kont]]
'''Beg ar vronn''' a vez graet eus ul lodenn eus ar [[bronn|vronn]], an hini uhelañ pa vez gourvezet ar [[korf|c'horf]].
 
Tanavoc'h eo [[kroc'hen]] ar vronn er beg anezhi, eno e c'hall laezh ar [[maouez]]ed treuziñ evit reiñ da zenañ. Graet eo beg ar vronn evit magañ, bezañ chutet, pe sunet, eta. Kerkent ha ganet e oar ar vugale klask beg ar vronn, ha chutal anezhañ.
 
Leun a [[nervenn]]où kizidik eo kroc'hen beg ar vronn. Pa deu riv d'ar c'horf, pe c'hoazh pa sav tan ar c'hoant ennañ, e teu begoù an divronn da stegnañ.<br />
A-hervez eo dre biñsañ anezho e c'haller gouzout ha van a ra [[paotr]] pe blac'h da vout semplet.
 
== Reizhelezh ==
 
== Dilhad ha giz ==
Al lodenn-se eus an divronn eo a veze klasket kuzhat ar muiañ, dre [[mezh|vezh-fur]], abalamour ma c'halle diskuliañ c'hoant ar c'horf. Tammoù dilhad da guzhat ar begoù-bronnoù a veze graet zoken.
 
Hiziv e kaver un emzalc'h kontrol gant tud zo. Graet e vez [[brennidenn]]où ken bihan ma ne guzhont nemet ar begoù-bronnoù, brennidennoù [[sav-bronnoù]] graet evit diskouez ar begoù dindan an dilhad, hep kontañ ar begoù faos, reut atav.
In the [[anatomy]] of [[mammal]]s, a '''nipple''' or '''mammary papilla''' is a small projection of [[skin]] containing the outlets for 15-20 [[lactiferous duct]]s arranged cylindrically around the tip.
''The skin of the nipple is rich in a supply of special [[nerve]]s that are sensitive to certain stimuli.''
The physiological purpose of nipples is to deliver [[milk]] to the infant, produced in the female [[mammary gland]]s during [[lactation]]. In the [[male]], nipples are often not considered functional with regard to [[breastfeeding]], although [[male lactation]] is possible.
 
Mammals typically have an even number of nipples arranged around bilaterally. They develop in the [[embryo]], along the '[[milk line]]s'. Most mammals develop multiple nipples along each milk line, with the total number approximating the maximum litter size, and half the total number (i.e. the number on one side) approximating the average litter size for that species. In the primitive mammals ([[monotreme]]s such as the [[platypus]]), the mammary glands empty onto the skin without a nipple. In cetaceans such as whales, the infant cannot form a suction-seal to nurse, due to its mouth structure. Therefore the whale's nipple is unlike that of any other mammal. Rather than requiring a sucking action, the discharge of milk is powered by maternal muscles. The calf takes the extended nipple into its mouth, and the mother ejects or expels her milk into the mouth of the calf.
The pigments of the nipple and areola are [[eumelanin|brown eumelanin]] (a brown pigment) and to a greater extent [[pheomelanin]] (a red pigment). Exposure to cold temperatures and [[breastfeeding]] are the primary causes for the nipples to become [[erect]]; nipple erections are a product of the pilomotor reflex which causes [[goose bumps]]. Less commonly, sexual arousal may cause the nipples to become erect, due to the release of the [[polypeptide]] [[neurotransmitter]] [[oxytocin]]{{Fact|date=June 2008}}. The nipple and areola of males and females can be erotic receptors. They are not, however [[sex organs]] because, since mammals of both sexes all have nipples, nipples don't possess the defining quality of a sex organ of differentiating the sex of any animal.
 
The average projection and size of human female nipples is slightly more than 3/8 inches (10mm).<ref>M. Hussain, L. Rynn, C. Riordan and P. J. Regan, Nipple-areola reconstruction: outcome assessment; European Journal of Plastic Surgery, Vol. 26, Num. 7, December, 2003</ref>. Pregnancy and nursing tend to increase nipple size, sometimes permanently. Pregnancy also increases the pigmentation. The erection of the nipple is partially due to the cylindrically arranged muscle cells found within it. In many women, there are small bulges on the areola, which are called '[[Glands of Montgomery|Montgomery bodies]]'.
 
Sometimes, [[baby|babies]] (male or female) are born producing milk. This is called '[[witch's milk]]'; it is caused by maternal [[estrogen]]s acting on the baby and is quite common. Witch's milk disappears after several days.