Bladder MeridianBL56

Chengjin 承筋

For reference only · not a substitute for diagnosis or treatment

Short answer

Back of the calf, 5 cun below the knee crease, in the groove between the two gastrocnemius bellies.

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

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

Chengjin — 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.

Chengjin — ③ Under the skin — **③ Under the skin**
Small saphenous vein · Medial head of gastrocnemius · Lateral head of gastrocnemius · Soleus muscle

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

On this page

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

1Where is Chengjin?

Back of the calf, 5 cun below the knee crease, in the groove between the two gastrocnemius bellies.

It is midway between BL55 and BL57.

Beneath the point

Small saphenous vein · Medial head of gastrocnemius · Lateral head of gastrocnemius · Soleus muscle

Our 3D measurement · In our 3D model: 5 cun (115.2 mm; 1 cun = 23.04 mm) below the knee crease, between the two heads of the gastrocnemius.

2How do I find it on my body?

Find Heyang (2 cun below the knee crease) and Chengshan (the dip at the lower end of the calf muscle).
Press the point halfway between them.

Check · it is in the groove between the two fullest parts of the calf.

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

lateral head of gastrocnemius: The outer of the two heads of gastrocnemius.
medial head of gastrocnemius: The inner of the two heads of gastrocnemius. It is bigger and reaches lower than the outer head.
small saphenous vein: A vein under the skin that starts on the outer foot, passes behind the outer ankle and climbs the middle of the back of the calf to the back of the knee.

3Before you press

⚠ Do not press when

If one calf is swollen, painful, red or warm, do not press — see a doctor (it may be a vein clot).
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 means 'supporting the sinews'. The Zhenjiu Jiayi Jing gives Shuanchang and Zhichang as alternative names.

From traditional texts — not a claim of effect.

?FAQ

Where exactly is Chengjin?

Back of the calf, 5 cun below the knee crease, in the groove between the two gastrocnemius bellies. It is midway between BL55 and BL57.

How do I find Chengjin?

Find Heyang (2 cun below the knee crease) and Chengshan (the dip at the lower end of the calf muscle). Press the point halfway between them. it is in the groove between the two fullest parts of the calf.

What should I watch out for?

If one calf is swollen, painful, red or warm, do not press — see a doctor (it may be a vein clot). Avoid broken or swollen skin and press only to a comfortable level. Acupressure is not a substitute for medical care.

← PreviousHeyang · BL55 Next →Chengshan · BL57

Sources

Location: WHO Standard Acupuncture Point Locations in the Western Pacific Region (2008), p. 127
Standard comparison: Chinese national standard GB/T 12346-2021 (Nomenclature and location of meridian points), p. 19 — 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

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.