Location. In the nasal cavity, on the mucous membrane at the site corresponding to Shangyingxiang (EX-HN8): inside the nostril, at the junction where the skin of the nose ends and the lining of the cavity begins.
The name is the inner counterpart of Yingxiang: nei means inside, and Yingxiang (LI20) is the channel point on the face beside the nose, so the name says that this is the same point of reference reached from within the nostril. It is a point outside the fourteen channels. Published sources describe the site in slightly different ways, some placing it at the front end of the inferior turbinate and others simply at the junction of skin and lining, so it is better read as a small area just inside the nostril than as one exact spot. Classical sources record pricking here to release a few drops of blood, and later literature discusses the point in the context of the nose and of the eyes. That is a matter of what is written rather than what has been shown: the classical record for this point is thin, its reported effects are not established by modern research, and this entry makes no claim of benefit.
定位。在鼻孔内，与上迎香（EX-HN8）相对处的鼻黏膜上；即鼻孔内皮肤与鼻黏膜交界之处。
穴名与迎香相对：「内」指在鼻孔之内，迎香（LI20）在鼻旁面部，故本穴即自鼻孔内取同一参照之处。为十四经之外的奇穴。各家对本穴所在的表述略有出入，有定在下鼻甲前端者，有只言鼻黏膜与皮肤交界处者，故宜作鼻孔内一小片区域看，而非一个精确点。古典记述有此处点刺出血者；后世文献多在鼻与目的语境下讨论本穴。此皆文献所载，并非已被证明之事：本穴古典记载较少，所述作用未经现代研究证实，本条不作疗效陈述。
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