一氧化氮合成酶阳性神经元主要集中在上丘浅灰质层、中脑水管周围灰质背外侧部、中缝背核、被盖背外侧核、中缝大核、三叉神经脊束核等部位.

• NOS positive neurons were mainly distributed in the superficial grey layer of the superior colliculus, the laterodorsal part of the central grey layer of the dorsal raphe nucleus, raphe magnus nucleus and nucleus of the spinal tract of the trigeminal nerve.