The kidneys store vital essence and are the source for growth and reproduction .They also govern water metablism and the reception of Qi.The kidneys open to the ears,and manifest in the hair.TCM attribute kindney to the water of five elements.
The kidney stores essence, main water main, the main gas, the foundation of Yin and Yang, kidney and bone in vivo, begin to understand the ear and the Yin, the body in the hair, the tzu chi for fear, for salivary in liquid, five line belongs to the water"