Bladder MeridianBL39

Weiyang 委陽

For reference only · not a substitute for diagnosis or treatment

Short answer

Back and outer side of the knee, on the knee crease, just on the inner side of the biceps femoris tendon.

Lower he-sea point of the Triple Energizer (Sanjiao)

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

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

Weiyang — 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.

Weiyang — ③ Under the skin — **③ Under the skin**
Long head of biceps femoris · Lateral head of gastrocnemius · Plantaris muscle · Popliteus muscle

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

On this page

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

1Where is Weiyang?

Back and outer side of the knee, on the knee crease, just on the inner side of the biceps femoris tendon.

Beneath the point

Long head of biceps femoris · Lateral head of gastrocnemius · Plantaris muscle · Popliteus muscle

Our 3D measurement · In our 3D model: on the knee crease (knee joint-line level), 2 mm inside the medial edge of the biceps femoris tendon; 38.7 mm lateral to BL40.

2How do I find it on my body?

Bend the knee slightly so the biceps femoris tendon stands out on the outer side of the back of the knee.
Follow the knee crease outward.
Just before you reach the tendon, press at its inner edge.

Check · it is on the same crease as Weizhong (BL40), further out.

📖 Words explained

long head of biceps femoris: The head of biceps femoris that starts from the sitting bone (ischial tuberosity).
lateral head of gastrocnemius: The outer of the two heads of gastrocnemius.
common fibular nerve: A branch of the sciatic nerve that passes the outer back of the knee and wraps around just below the head of the fibula. It lies right under the skin over bone there, so pressure easily makes the outer leg tingle.

3Before you press

⚠ Do not press when

The common fibular nerve runs close to the surface along the inner edge of the biceps femoris tendon.
Do not rub hard.
Stop if tingling spreads to the shin or the top of the foot.
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 Lingshu (ch. 2 and ch. 4) names it the lower he-sea point of the Triple Energizer — a historical classification, not a claim of effect.
The name joins wei (bend) and yang (outer side): the outer side of the knee bend.

From traditional texts — not a claim of effect.

?FAQ

Where exactly is Weiyang?

Back and outer side of the knee, on the knee crease, just on the inner side of the biceps femoris tendon.

How do I find Weiyang?

Bend the knee slightly so the biceps femoris tendon stands out on the outer side of the back of the knee. Follow the knee crease outward. Just before you reach the tendon, press at its inner edge. it is on the same crease as Weizhong (BL40), further out.

What should I watch out for?

The common fibular nerve runs close to the surface along the inner edge of the biceps femoris tendon. Do not rub hard. Stop if tingling spreads to the shin or the top of the foot. Avoid broken or swollen skin and press only to a comfortable level. Acupressure is not a substitute for medical care.

← PreviousFuxi · BL38 Next →Weizhong · BL40

Sources

Location: WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008), p. 119
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)
Classification source: Lingshu ch. 2 (Ben Shu) and ch. 4 (Xieqi Zangfu Bingxing); Zhenjiu Jiayi Jing vol. 3, sec. 35
Safety cross-check: AcuAtlas dataset caution note (common fibular 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.