Cheng, bear; tendons, refers to the gastrocnemius muscle. The point is located in the belly of the gastrocnemius muscle, hence the name.

[Location]

Chengjin (BL56) acupoint
(quoted from "Meridians and Acupoints")

• Zhenjiu Jiayi Jing: "In those who are trapped in the middle of the intestines";
• Suwen ‧Study on LumbagoWang Bing Note: "In The five inches of the body cun below the popliteal joint are connected to the acupoint 鄄中 and the lower part is the position of Shenmai (BL62). This is the Chengjin (BL56) point, which is the acupoint of the popliteus. The center is like the center of the outside."
• Qianjin Yaofang‧: "Behind the shin, seven inches from the heel";
• Xunjing Kaoxue Bian: "Living in Chengshan (BL57) One inch up”.

[Anatomy]

• Muscle: between the two muscle bellies of the gastrocnemius.
• Nerve: medial sural cutaneous nerve, deep layer is tibial nerve.
• Vessel: small saphenous vein, deep layer is posterior tibial artery and vein.

[Manipulation]

Perpendicular insertion 1～1.5 inches. moxa cone moxibustion 3 to 5 times, moxa stick warm moxibustion for 5 to 10 minutes.

[Efficacy]

Benefit the waist and legs, regulate large intestine, and lift the anus.

• Classical: Hanre, scabies, calf soreness, tarsal pain, foot spasm, heel pain, constipation, prolapse of rectum, hemorrhoids, low back pain, muscle cramp, headache Dizziness, abdominal pain, peripheral abscess, bloody defecation, and epistaxis.
• Modern: gastrocnemius spasm, sciatica.

[Recipe]

• Difficulty in defecation and defecation: Chengjin (BL56), Dadu (SP2), Dadun (LR1).