Intersecting point: Zhenjiu Jiayi Jing: Intersecting point of heel vessel and hand and foot yangming; Zhenjiu Dacheng refers to "heel vessel" as "yang heel vessel"; Zhenjiu Juying: supplements Conception Vessel (CV).

bubble_chart Etymology

"Di" (地) refers to the lower part; "cang" (倉) , warehouse. Face is divided into three courts: the area above nose is the upper court (heaven), nose itself is the middle court (human), and the area below nose is the lower court (earth). The acupoint is located beside the corner of mouth, within the lower court of face. The oral cavity serves as the entry point for receiving food and water, hence the name. Because it is close to the corner of mouth, it is also called "Weiwei" (Zhenjiu Jiayi Jing and Waitai Miyao mistakenly write it as "Huiwei").

bubble_chart Location

Dicang (ST4) acupoint
(adapted from "Meridians and Acupoints")

On face, lateral to the corner of mouth, directly below pupil, near the lower end of nasolabial groove. It is 0.4 cun lateral to the corner of mouth and on the midline of eye.

• Zhenjiu Jiayi Jing: "Four fen beside the corner of the mouth, slightly closer to the lower side";
• Zhenfang Liuji: "In the crease."

bubble_chart Anatomy

• Muscles: orbicularis oris, buccinator.
• Nerves: buccal nerve of mandibular nerve, buccal branch of facial nerve.
• Vessels: Facial artery and vein.

bubble_chart Manipulation

Pinch the muscle at the corner of mouth and insert the needle subcutaneously toward Jiache (ST 6) for 1-1.5 cun.

bubble_chart Efficacy

Dispell pathogenic wind, unblock qi stagnation, facilitate joint movement.

• Classical: crooked mouth and eyes, inability to speak, hoarseness, drooling, atrophy-flaccidity of limbs and inability to walk, manic behavior with cursing and striking, constipation in children, fluid retention, inability to retain food or drink, leakage of fluids, continuous twitching of eyelids, inability to close eyes.
• Modern: Facial nerve palsy, trigeminal neuralgia, thrush.

bubble_chart Combinations

• Trigeminal neuralgia: Dicang (ST4), Yuyao (EX-HN4), Sibai (ST2).
• Drooling: Dicang (ST4), Jiache (ST6), Zhongwan (CV12), Youmen (KI21), Daling (PC7), Xiajuxu (ST39), Rangu (KI2).
• Thrush: Dicang (ST4), Hegu (LI4).
• Facial deviation due to stroke: Dicang (ST4), Jiache (ST6), Hegu (LI4), Neiting (ST44 ), Taichong (LR3).