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【Location】On the face，0.4 cun lateral to the corner of the mouth.
【Manipulation Method】Puncture perpendicularly 0.2 cun，or puncture subcutaneously toward Jiache（ST 6）1-2cun.
【Indications】Deviated mouth，salivation，twitching of eyelids，flabby lips，toothache，swelling in the cheek.
【Stratified anatomy】（Fig.1-14，Fig.1-15）
Fig.1-14 Sagittal section of Dicang（ST 4）（right side）
Fig.1-15 Transverse section of Dicang（ST 4）（right side）
（1）Skin The skin is distributed by infraorbital and buccal n..
（2）Subcutaneous tissue There are branches of infraorbital and buccal n.，branches or tributaries of facial a. ＆ v..
（3）Orbicularis oris The orbicularis oris is located in the lip around the oral fissure.
（4）Depressor anguli oris The depressor anguli oris is located in the deep surface of superficial fascia under the corner of the mouth.
