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Old 08-17-2011, 12:24 PM   #1
hjzps1748
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Default 男孩如何自查是否发育成熟

男孩子一般在12岁左右睾丸开始增长,18岁左右已接近成人睾丸的容积。睾丸发育,容积增大,是青春期生长 、发育的重要反映;自己不时用手触摸睾丸,会感到它在慢慢的长大。

于此同时,男孩13岁以后出现遗精,睾丸的间质细胞开始分泌出雄性激素(睾丸酮),会做性梦,阴茎常会勃起 。随着其激素在血浆中的浓度不断增加,光波炉的危害,生殖器官进一步发育成熟,出现嗓音变粗,喉结突起,长出比较密集的胡须和腋毛、阴毛长出等第二性征。   可经常观察外生殖器,发现阴囊颜色变深、变大,一般在9-12岁以后,阴囊开始增大,伴以阴囊变红和皮肤质地的改变;

12-15岁以后,阴茎的长度和周径增加,但周径增加较长度增加为缓,阴茎细长。15-18岁以后,阴茎和阴囊进一步发育增大,加湿器价格,阴囊的颜色深,水宜生,阴茎周径变粗,阴茎头发育向前伸展,脱离阴茎包皮的覆盖,完全或大部分地暴露于包皮以外,接 近成年型。

阴毛从青春期约在12岁开始生长,由稀疏、纤细逐步变为密集、黑,呈密集型分布。阴毛也受睾丸和肾上腺所产 生的雄性激素的影响,随着性器官的发育成熟,雄性激素分泌增多,大约18岁以后,男孩子阴毛呈尖顶三角形分 布,其尖端通常达到小腹部,与典型的成年男子的阴毛相似。

男孩子在青春期性发育过程中,健尔马足疗机官网,遇到以上情况不应惊慌,如果没有身体不适,可认为发育正常。
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