Anatomy of the heart in ancient Chinese medicine, woodcut

From an edition published in 1537 (16th year of the Jiajing reign period of the Ming dynasty). The heart is lord of the five zang viscera. Collected Gems of Acupuncture and Moxibustion, Vol. 1 states: 'The heart weighs 12 liang (Chinese oz., c. 50 gr). It is located next to the fifth spinal vertebra, below the lungs and above the diaphragm. It contains 7 orifices and 3 'hairs'. It is shaped like a lotus bud.' .