Cheng, bear; mountain, mountain, describes the gastrocnemius muscle. The hole is located under the muscle belly of the gastrocnemius bulge, hence the name.

[Location]

Fenglong, Chengshanacupoint cross section
(quoted from "Yan Zhenguo acupoint anatomy")

Chengshan (BL57) acupoint
(quoted from "Meridians and Acupoints")

The middle of the back of the calf, 8 inches below Weizhong (BL40), below the gastrocnemius muscle belly, when Between Weizhong (BL40) and Kunlun (BL60), a sharp-angled depression appears when the calf is straightened or the heel is lifted.

• Zhenjiu Jiayi Jing: "In the middle of the sliced ​​meat under the (sharp) Pork Sausage" ,
• Bian Que Xinshu: "Put it under the calf, lift your toes and take it."
• acupuncture and moxibustion Jade Dragon Sutra‧Jade Dragon Song Note : "Eight inches above Pucan (BL61), divide the meat under the calf."
• Yixue Rumen : " Separate the meat under the buttocks, lift your feet to the ground and take it out. "
• Zhenjiu Jicheng: "In Weizhong ( BL40) eight and a half inches lower."

[Anatomy]

• Muscle: The lower end of the junction of the two muscle bellies of the gastrocnemius. When the muscle and tendon are connected, there is a tendon organ in the center and muscle spindles around it.
• 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, relax the muscles, regulate the intestines, lift the anus, and stop diarrhea.

• Classical: lumbar spine pain, lower limb soreness, heel pain, foot cramps, sore throat, constipation, prolapse of rectum, muscle cramp, athlete's foot, diarrhea, dysentery, knee swelling, Hanre, malaria, inability to stand while fighting, hematochezia, hemorrhoids.
• Modern: low back and leg pain, sciatica, gastrocnemius spasm, lower limb paralysis.

[Recipe]

• Shaking and soreness: Chengshan (BL57), Jinmen (BL63).
• hematochezia: Chengshan (BL57), Fuliu (KI7), Taichong (LR3), Taibai (SP3).
• Difficulty in defecation: Chengshan (BL57), Taixi (KI3).
• Hemorrhoid fistula disease, bloody defecation New blood: Changqiang (GV1), Chengshan (BL57).
• Hemorrhoids: Erbai (EX-UE2), Chengshan (BL57).