Small Intestine
SI9
肩贞 · Jianzhen
True Shoulder
Back of the shoulder, just above the armpit crease.
Local posterior shoulder point
System
- Channel
- Small Intestine (SI)
- Element
- Fire
- Yin or yang
- yang
- Organ system
- Small Intestine
- Region
- Shoulder and arm
- Limb rule
- Hand Taiyang
Where it is
On the back of the shoulder, about one thumb-width above the back crease of the armpit, when the arm hangs.
Nearby: Posterior shoulder muscles. The chest cavity is forward and deep if a needle is aimed the wrong way.
Traditionally said to
Local point for pain at the back of the shoulder and the shoulder blade.
What people look up
Acupressure
Arm hanging, press the muscle for 45–60 seconds. Not into the armpit.
When not to press: Skip if the shoulder is hot and swollen or you cannot lift the arm after an injury.
About 30–90 seconds is the usual window, unless the step above is shorter. Stop if pain, dizziness, or anything unusual shows up.
Licensed practice only
Needle depth, angle, electroacupuncture
Textbook language for students. Not instructions. A cun is a body-inch on that person, not a ruler inch. Do not needle yourself.
Depth
Often listed around 1–1.5 cun into the muscle. Do not aim forward into the chest. Confirm in a manual.
Angle
Perpendicular, into the posterior deltoid / teres region.
Electroacupuncture
Introductory charts rarely assign a standard electroacupuncture setting here. Clinics that use current choose frequency and intensity for that person. No milliamp figure is given, because copying one would be misleading.
Nearby on this channel
Small Sea
Elbow groove point. Easy to overdo because of the nerve.
Use caution
Celestial Gathering
Center of the shoulder blade for that deep scapular ache.
Use caution
Support the Aged
Wrist cleft that opens when the palm turns inward.
Listening Palace
The hollow in front of the ear, found with the mouth soft and open.
Use caution
Herbs often paired for a similar pattern
A study link, not a formula and not a dose.
Tags
jianzhen · posterior shoulder