The Brain, Marrow and Womb

Besides the viscera and bowels, there are other organs known as the odd and constant organs, including the brain, marrow, and womb. These organs perform different functions, but they are interconnected and influence each other.

The odd and constant organs also include bone, vessels, and the gallbladder. The gallbladder holds a unique status as it is considered both a bowel and an odd and constant organ.

The brain is the uppermost organ among the six odd and constant organs and is the material base for all mental activities, also known as "the organ of original spirit." The pathways in which the marrow travels extend from the brain to the coccyx and sacrum. This concept is similar to the modern Western understanding of the central nervous system.

The brain and marrow are closely connected to the kidneys. The kidneys control bones, which generate marrow that travels through the brain, known as the "sea of marrow." When the pure energy of the kidneys is abundant, the marrow in the brain is in full supply, leading to higher energy and better mood. In women, the womb (or uterus) is responsible for menstruation and nourishing the embryo and fetus. The function of the uterus is dependent on the fullness of the pure energy of the kidneys.