C40

According to the < < True Sutra of the Yuan and the Great Concordance > >, the five internal organs and thirty-six blood orifices formed the momentum of Heavenly Dipper as well as the seventy-two internal organs and blood orifices.

The spleen belongs to the earth, and the yin and yang are hidden within. There are five orifices, the three are bright, and the yin and yang are hidden