According to

traditional Chinese medicine Traditional Chinese medicine (TCM) is an alternative medical practice drawn from traditional medicine in China. It has been described as "fraught with pseudoscience", with the majority of its treatments having no logical mechanism of action ...

, the kidney (

Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of va ...

: 腎: ''shèn'') refers to either of the two viscera located on the small of the back, one either side of the spine. As distinct from the Western medical definition of kidneys, the TCM concept is more a way of describing a set of interrelated parts than an anatomical organ. In TCM the kidneys are associated with "the gate of Vitality" or "Ming Men". A famous Chinese doctor named Zhang Jie Bin (approximately 1563-1640) wrote "there are two kidneys, (kidney yin and yang), with the Gate of Vitality between them. The kidney is the organ of water and fire, the abode of yin and yang, the sea of essence, and it determines life and death."

TCM overview

The kidney (Shen) is a Zang organ meaning it is a

Yin Yin may refer to: *the dark force in the yin and yang from traditional Chinese philosophy and medicine *Yīn (surname) (), a Chinese surname *Yǐn (surname) (), a Chinese surname *Shang dynasty, also known as the Yin dynasty **Yinxu or Yin, the S ...

organ. The other Yin, or Zang, organs are the

lungs The lungs are the primary organs of the respiratory system in humans and most other animals, including some snails and a small number of fish. In mammals and most other vertebrates, two lungs are located near the backbone on either side of th ...

(Fei),

liver The liver is a major Organ (anatomy), organ only found in vertebrates which performs many essential biological functions such as detoxification of the organism, and the Protein biosynthesis, synthesis of proteins and biochemicals necessary for ...

(Gan),

spleen The spleen is an organ found in almost all vertebrates. Similar in structure to a large lymph node, it acts primarily as a blood filter. The word spleen comes .

(Pi), and

heart The heart is a muscular organ in most animals. This organ pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide t ...

(Xin). Sometimes the

pericardium The pericardium, also called pericardial sac, is a double-walled sac containing the heart and the roots of the great vessels. It has two layers, an outer layer made of strong connective tissue (fibrous pericardium), and an inner layer made of ...

(Xin Bao) is included. Yin organs store, secrete, make, and transform essence, blood, spirit, Qi, and fluids.

Kidney main functions

The main functions of the kidney are: *storing essence ('' jing'') and dominating human reproduction and development *dominating water metabolism and the reception of qi from the air (''Kong Qi'') *producing marrow to fill up the brain *dominating bone *manufacturing blood *manifesting in the hair (on the head) *opening into the ear and dominating the two lower ''yin'' (the anus and

urethra The urethra (from Greek οὐρήθρα – ''ourḗthrā'') is a tube that connects the urinary bladder to the urinary meatus for the removal of urine from the body of both females and males. In human females and other primates, the urethra con ...

) *dominating anterior and posterior orifices. *housing the ''Zhi'' (will-power) *fluid secretions are

urine Urine is a liquid by-product of metabolism in humans and in many other animals. Urine flows from the kidneys through the ureters to the urinary bladder. Urination results in urine being excretion, excreted from the body through the urethra. Cel ...

semen Semen, also known as seminal fluid, is an organic bodily fluid created to contain spermatozoa. It is secreted by the gonads (sexual glands) and other sexual organs of male or hermaphroditic animals and can fertilize the female ovum. Semen i ...

, and vaginal fluids.

Storing essence and dominating development and reproduction

The kidney's primary function is storing and controlling 'essence', or ''jing''. ''Jing'' is the essence of ''qi'' and the basis for body matter and functional activities. There are two types of ''jing'', congenital jing and acquired jing, which are stored in the kidney and known as kidney jing. Unlike qi, ''jing'' circulates in long cycles (seven years for females and eight years for males) governing developmental stages. The function of ''jing'' is to promote growth, development and reproduction, provide the basis for kidney qi, produce marrow, and provide the basis for jing, qi and shen (mind). Congenital jing comes from the parents and determines basic constitution; it cannot be altered, but it can be positively influenced by acquired jing. Acquired jing is produced from food by the spleen and stomach, stored in the kidney and circulated in the body. Congenital and acquired jing have a promoting/ controlling relationship with each other and their interaction produces kidney jing; all three play a part in determining growth and development, sexual maturation, reproduction, and aging. Every new jing cycle prompts a new cycle of development. For example, congenital jing exists from conception, carrying on from the jing of the parents. Once a child is born, acquired jing is responsible for replenishing congenital jing and starting the first independent jing cycle which, for the next seven years in girls and eight years in boys, will control growth and development. When the child loses its baby teeth, its body begins the pre-adolescence cycle. The next jing cycle is adolescence, when kidney jing matures and causes the ren meridian to open and flow. At this time, part of the kidney jing transforms into tian gui, which develops and maintains reproductive function. In the next stage physical growth finishes, and eventually declining jing leads to exhaustion of tian gui, thus extinguishing reproductive ability. Inevitably, decline of jing leads to death.

Energy aspects

All of the four kidney energy aspects are essential in growth and development. These four aspects include kidney jing (essence), kidney yin (water), kidney

yang Yang may refer to: * Yang, in yin and yang, one half of the two symbolic polarities in Chinese philosophy * Korean yang, former unit of currency of Korea from 1892 to 1902 * YANG, a data modeling language for the NETCONF network configuration pr ...

(fire) and kidney qi. All of the body's functions rely on the heat provided by kidney qi and the gate of life (the space between the left and right kidneys). Kidney jing is the foundation of the yin and yang of all the body's organs. Kidney yin and yang are the primordial yin and yang, and the root of yin and yang to the zang organs. Kidney yin moistens and nourishes, while kidney yang provides warmth and promotes organs and tissue. kidney yang is the dynamic force necessary to start the system of balancing water metabolism, which also employs the spleen, lung, liver and san jiao.

Dominating water metabolism

The kidney is considered a water element. As the body's water gate, it regulates water metabolism and reception of qi. The foundation of yin fluid that nourishes and moistens the body is kidney yin. When the kidney receives fluid the qi of kidney yang divides it into two types, clear and turbid. Clear fluid is sent upward through San Jiao to moisten the lung and for the lung to distribute to the body, while turbid fluid is sent downward for expulsion by the

bladder The urinary bladder, or simply bladder, is a hollow organ in humans and other vertebrates that stores urine from the kidneys before disposal by urination. In humans the bladder is a distensible organ that sits on the pelvic floor. Urine enters ...

. The water gate is also responsible for regulating the opening and closing of drainage ducts, namely the bladder and

anus The anus (Latin, 'ring' or 'circle') is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, the residual semi-solid waste that remains after food digestion, which, d ...

, which rely on the activity of kidney qi. Also, while lung qi controls respiration, kidney qi coordinates inhalation.

Additional functions

The kidney is responsible for hair luster, production of bone and brain matter, correct functioning of the ears, and regulating the opening and closing of the bladder and anus. Mentally, its responsible for supporting memory, while emotionally it is linked to determination, or willpower (zhi).Dong, 2006, p. 29-30 & Maciocia, 2005, p. 93)

Notes

Bibliography

* Cheng, X.-n., Deng, L., & Cheng, Y. (Eds.). (1987). ''Chinese Acupuncture And Moxibustion''. Bei jing: Foreign Languages Press. * Dong, Lin (2006). ''Lecture Notes For COTH2140 Chinese Medicine Theory 1 History Of Chinese Medicine Component''. RMIT University: Bundoora West. * Maciocia, G. (2005). ''The Foundations Of Chinese Medicine: A Comprehensive Text For Acupuncturists And Herbalists''. Philadelphia, Massachusetts: Elseverier Churchill Livingstone. * Zhiya, Z., Yanchi, L., Ruifu, Z. & Dong, L. (1995). ''Advanced Textbook On Traditional Chinese Medicine And Pharmacology (Vol. I) ''. Beijing: New World Press. * Yin, H.-h., & Shuai, H.-c. (1992). ''Fundamentals Of Traditional Chinese Medicine''. Beijing, China: Foreign Languages Press. {{Traditional Chinese medicine Traditional Chinese medicine