Location. In the mouth, on the floor of the mouth, at the midpoint of the frenulum of the tongue; the point is taken with the mouth open and the tip of the tongue raised to the palate.
The name means sea spring, an image of a source of fluid, and it is one of the small group of points located on the floor of the mouth rather than on the surface of the body. It is a point outside the fourteen channels. Published sources differ slightly on whether the point is the midpoint of the frenulum or the small depression just behind it, so the site is better read as the midline of the frenulum region than as one exact spot. Classical sources record pricking here to release a drop of blood, and later literature discusses the point in the context of the tongue and of thirst. The classical record is thin, the reported effects are not established by modern research, and this entry makes no claim of benefit.
定位。在口腔内，舌下，舌系带（舌下系带）的中点处；张口、舌尖上卷抵上腭取之。
穴名取「海泉」之义，喻津液汇聚之源。为十四经之外的奇穴，属位于口腔底部（而非体表）的一小类穴。各家对本穴所在的记述略有出入：有定在舌系带中点者，有定在其后小凹陷者，故宜作舌系带中线上的一片区域看，而非一个精确点。古典记述有此处点刺出血少许者；后世文献多于舌与口渴的语境下讨论本穴。本穴古典记载较简，所述作用未经现代研究证实，本条不作疗效陈述。
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