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男性进入青春期后,随着雄性激素分泌增加,性意识开始觉醒,可因有关性内容的视觉、听觉、嗅觉、触觉以及思维、想像等刺激,使大脑皮层产生兴奋,并通过脊髓的胸腰段勃起中枢传出,作用于阴茎海绵体,使阴茎动脉血管扩张,大量的血液流入阴茎海绵体;静脉血管收缩,流出海绵
Men into adolescence, with the increase of male hormone secretion, sexual awareness began to wake up, due to sexual content related to visual, auditory, olfactory, tactile and thinking, imagination and other stimuli, the cerebral cortex excited, and through the thoracolumbar spinal cord Erection of the Central Emancipation, the role of the penis, the penis artery dilation, a large amount of blood flow into the penis; venous contraction, out of the sponge