阴茎勃起既和阴茎海绵体勃起组织的结构有关 ,又牵涉到有关的神经支配。阴茎勃起的生理基础是动脉血流增加 ,同时静脉回流阻塞 ,使阴茎海绵体内压力急剧升高 ,产生勃起。在此过程中 ,动脉和海绵窦平滑肌的舒缩及静脉回流阻塞都与神经调节有关。近年来研究表明 ,一氧化氮 (Ｎｉ Penile erection both penile erection and erection of the structure, but also related to the innervation. The physiological basis of penile erection is the increase of arterial blood flow, meanwhile the obstruction of venous return clogged up the pressure in the penis cavernous body to produce erection. During this process, the arteries and cavernous sinus smooth muscle contraction and venous return obstruction are related to the regulation of nerves. In recent years, studies have shown that nitric oxide (Ni