图 1.
吸气时鼻气道气流流动情况
吸入气体通过鼻孔进入，在宽敞的鼻前庭(V)气流以湍流为主(弯曲白线)。在通过狭窄的鼻阀区即鼻阈(NV)时以高速的层流为主(黄色线)。大部分气流(粗黄线)沿抛物线从下鼻甲上方通过，另外在下鼻甲下方(细黄线)和朝向前颅底的上方(细黄虚线)也有少量气流通过。鼻腔内气流最终于鼻咽(NP)部汇合。
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