Bladder MeridianBL37

Yinmen 殷門

For reference only · not a substitute for diagnosis or treatment

Short answer

Back of the thigh, 6 cun below the gluteal fold, in the groove between the biceps femoris and semitendinosus muscles.

See it in 3DRotate the body and peel back the skin to see the bones and muscles beneath.
Open the 3D Acupoint Map →

🖼See it in pictures

Yinmen — ① Where on the body? — **① Where on the body?**

Yinmen — Textbook view — skin on the left, muscle and bone underneath on the right — **Textbook view — skin on the left, muscle and bone underneath on the right**
Location and structures come from our 3D model; only the drawing style was refined with AI. Labels are added by us.

Yinmen — ③ Under the skin — **③ Under the skin**
Semitendinosus muscle · Long head of biceps femoris · Semimembranosus muscle

Rendered straight from the 3D model at the computed location. The glowing ring marks Yinmen.

On this page

Where is Yinmen?
How do I find it on my body?
Before you press
How has it been used traditionally?
FAQ

1Where is Yinmen?

Back of the thigh, 6 cun below the gluteal fold, in the groove between the biceps femoris and semitendinosus muscles.

It is 1 cun above the midpoint of the line from BL36 to BL40.

Beneath the point

Semitendinosus muscle · Long head of biceps femoris · Semimembranosus muscle

Our 3D measurement · In our 3D model: 6 cun (149.3 mm; 1 cun = 24.88 mm) below BL36, between the biceps femoris and the semitendinosus.

2How do I find it on my body?

Find the middle of the gluteal fold (Chengfu) and the middle of the knee crease (Weizhong). They are 14 cun apart.
From the midpoint of that line (7 cun), go 1 cun up. That is 6 cun below the gluteal fold.
Lying face down, bend the knee against resistance. The biceps femoris (outer) and semitendinosus (inner) separate.

Check · the point is in the groove between them.

What is a “cun”?

A cun is a body-scaled unit of length. The precise way is to divide a bone length into equal parts (proportional bone cun); finger widths are a quick estimate.

📖 Words explained

long head of biceps femoris: The head of biceps femoris that starts from the sitting bone (ischial tuberosity).
sciatic nerve: The thickest nerve in the body. It comes out deep in the buttock (below piriformis) and runs down the middle of the back of the thigh, splitting above the knee into the tibial and common fibular nerves.
semitendinosus: A muscle on the inner back of the thigh. Its lower half is a long tendon, hence its name; bend the knee and the thin tendon stands out like a cord on the inner side of the back of the knee.
gluteal fold: The horizontal crease where the buttock meets the back of the thigh.
semimembranosus: A muscle on the inner back of the thigh, under semitendinosus, that bends the knee. Its upper part is a wide sheet, hence its name.

3Before you press

⚠ Do not press when

The sciatic nerve runs deep here.
Stop if tingling shoots down the leg.
Avoid broken or swollen skin and press only to a comfortable level.
Acupressure is not a substitute for medical care.

4How has it been used traditionally?

The name reads 'gate of abundance', for the thick muscles of the back of the thigh.
WHO's bone measure from the gluteal fold to the knee crease is 14 cun; this point is 6 cun down that span.

From traditional texts — not a claim of effect.

?FAQ

Where exactly is Yinmen?

Back of the thigh, 6 cun below the gluteal fold, in the groove between the biceps femoris and semitendinosus muscles. It is 1 cun above the midpoint of the line from BL36 to BL40.

How do I find Yinmen?

Find the middle of the gluteal fold (Chengfu) and the middle of the knee crease (Weizhong). They are 14 cun apart. From the midpoint of that line (7 cun), go 1 cun up. That is 6 cun below the gluteal fold. Lying face down, bend the knee against resistance. The biceps femoris (outer) and semitendinosus (inner) separate. the point is in the groove between them.

What should I watch out for?

The sciatic nerve runs deep here. Stop if tingling shoots down the leg. Avoid broken or swollen skin and press only to a comfortable level. Acupressure is not a substitute for medical care.

← PreviousChengfu · BL36 Next →Fuxi · BL38

Sources

Location: WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008), p. 118
Standard comparison: Chinese national standard GB/T 12346-2021 (Nomenclature and location of meridian points), p. 18 — same location
Korean anatomical terms: KMLE medical dictionary
Traditional-use cross-check: AcuAtlas dataset (CC BY 4.0)
Classical record: Zhenjiu Jiayi Jing vol. 3, sec. 35
Safety cross-check: AcuAtlas dataset caution note (sciatic nerve)

Positions computed from the WHO standard locations (2008) on Z-Anatomy (CC BY-SA 4.0) · BodyParts3D © DBCLS. For reference only — not a substitute for diagnosis or treatment. See a clinician if you are unwell.