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【Location】On the face，in the depression of the centre of the mentolabial groove.
【Manipulation Method】Puncture obliquely 0.3-0.5 cun.
【Indications】Deviated mouth，toothache，salivation，sore of tongue and mouth，sudden loss of voice，epilepsy.
【Stratified anatomy】（Fig.1-13）
（1）Skin The skin is distributed by mental n..
（2）Subcutaneous tissue There are mental n.，a. ＆ v..
（3）Orbicularis oris The orbicularis oris is located in the lip around the oral fissure.
（4）Depressor labii inferioris The depressor labii inferioris is located in the deep surface of superficial fascia under the corner of the mouth.
（5）Mentalis The mentalis is located in the deep surface of depressor labii inferioris.