Pinyin: Yǐn Bái
On the medial side of the big toe, about 0.1 cun posterior to the corner of the nail.
SP-1 is located at the junction of two tangents drawn along the medial and proximal border of the nail of the big toe, approximately 0.1 cun from the margin of the nail.
0.1–0.2 cun vertically or obliquely in a proximal direction or prick to bleed with a needle, lancet or three-edged needle.
Yinbai SP-1 is widely used to stop bleeding in all parts of the body, especially the Uterus bleeding. Other places of bleeding include the nose, Bladder, Intestines and Stomach.
It achieves this function, thanks to its ability to regulate the Spleen which, as a result, is able to hold the Blood firmly in the vessels. In this case, direct moxa is recommended.
Furthermore, Yinbai SP-1 calms the Heart and the Mind. It also restores consciousness. This is often caused by Blood Stagnation with typical symptoms such as agitations, sighing, sadness, manic depression, excessive dreaming and insomnia.
Finally, Yinbai SP-1 connects to the Stomach Channel via a branch from Lidui ST-45 of the second toe. It has influence from the Stomach Channel.
Actually for all the Channels that originates at the fingertip or toes, this principle applies. Their first point (Well-Jing) receive Qi and impact from the related Channels which terminate at the finger or toes.
For example, for all the Channels of the Hand (Yang starts while Yin ends):
For all the Channels of the Foot (Yin starts while Yang ends):