Chinese medicine recognizes five [Yin Organs] (also know as [zang organs]): the [Heart], [Lung], [Spleen], [Liver] and [Kidney]. The [zang Organs] are firmer, more solid, than the [fu] ([Yang]) [Organs]. The [Yin Organs] transform, store and move the fundamental substances of the body.
The [Yin Organs] are thought of as being deeper inside the body. They are generally more medically important. The [Pericardium] is sometimes considered a sixth [Yin Organ].