大横 : Daheng : Great Horizontal

Location Guides:

Meetings:

Meeting of Spleen with Yin Wei Mai and Dai Mai

Location:

On the abdomen, in the depression at the lateral border of the rectus abdominis muscle, 4 cun from the midline, level with the umbilicus.

Needling:

Perpendicular insertion 0.5 - 1 cun.

Warnings:

In thin patients, deep needling may penetrate the peritoneal cavity. Deep needling at this point may penetrate a substantially enlarged spleen or liver.

Classical Needling:

"The Taiyin usually has much Qi and little Blood" (Su Wen 素問 ch. 24) implying this channel should normally be needled.
"The foot Taiyin is to be pierced 3 fen deep and remain inserted for four exhalations" (Ling Shu 靈樞 ch. 12).
"It is needled to a depth of seven fen and moxaed with five cones" (Huangfu Mi 皇甫謐, 3rd Century, Zhenjiu Jiayi Jing 針灸甲乙經).

TCM Actions:

Moves Qi and regulates the Intestines

TCM Indications:

• Lower abdominal pain, cold and pain of the lower abdomen, cold or damp (dong) diarrhoea, Dysenteric Disorder (痢疾, Li Ji), constipation, sensation of heat in the hypogastrium with sighing.
  
• Propensity to sadness, sighing, inability to raise and move the four limbs, copious sweating.

Neuroanatomy:

Superficial Innervation: Lateral cutaneous thoracic nerve from T11

Dermatome Segment: T11

Martial Applications & Effects of Injury:

Striking this point can cause instant diarrhoea and great nausea but is too well protected by the external obliques to strike easily, especially on a trained opponent (Montaigue, Dim Mak Locations, Taijiworld.com).

Major Combinations:

• Arched back with sorrowful weeping:
    Daheng Sp-15 with Tianchong GB-9
    (Gao Wu, 高武, 1529: Bai Zheng Fu, 百症賦, Ode of a Hundred Symptoms).
  
  
• Constipation:
    Daheng Sp-15 with Dachangshu Bl-25 and Zhigou SJ-6 (Deadman, Al-Khafaji and Baker, 2001, A Manual of Acupuncture).

Notes:

Classical texts such as the Nei Jing and Ling Shu which considered the Dai mai as simple a circle around the waist, would include this as a point on the Dai mai, along with others level to Shenque Ren-8 and Mingmen Du-4 instead of the traditional points (Yuen, 2005, The Eight Extraordinary Vessels).

横 "Horizontal" comprises of the characters for Wood and Yellow, the colour associated with Earth, suggesting a role in imbalances of Wood and Earth. This also happens to be the horizontal line on the traditional 5 element pentagram showing the controlling Ko cycle. Other meanings can imply cutting across or going against the grain such as "unreasonable, perverse, unexpected" which may also support this.

Daheng is also a homonym for 大恆 "Great Constant" which is the name used for Taiji in the early silk manuscript of the I Ching found in the Mawangdui tombs, from 168 BC (Adler, J.A., 2012, On Translating Taiji).

In nine palaces abdominal acupuncture, this point is located in the region associated with ☳ Zhen, Thunder, the east and the Liver and Gallbladder organs on the right; and ☱ Dui, Lake, the west and the Lung and Large Intestine on the left (Schelbert, 2014, Ryan, 2009).

In Tibetan medicine:
Moxa point (AMNH, Tibetan Medical Paintings)

In Thai massage:
Point along the Sahatsarangsi (left) and Tawaree (right) sen lines ascending up the outer leg to the abdomen and chest (Salguero & Roylance, 2011, Encyclopedia of Thai Massage)

Reference Notes:

Basic information on location, needle depth, TCM actions, indications and combinations is taken from Deadman et al (2001): A Manual of Acupuncture with additional anatomical information researched by reference to Gray's Anatomy (38th Ed., 1995) unless otherwise referenced. Images were found on acupunctureschoolonline.com and can be traced back to Claudia Focks (2008) Atlas of Acupuncture originally. I cannot claim any credit or rights over them. Other sources should be quoted in the text.

For some of the more unusual terms I have created a glossary here