[Location] Localized in the sitting position or supine position. On the face, lateral to the comer of the mouth, directly below the pupil of the eye. (Fig.41)
[Regional Anatomy] Skin→subcutaneous tissue→orbicularis oris→depressor muscle of angle of mouth. The gena branch and the oculomotor branch of the trigeminal nerve, the branches or the subordiantial ramus of the facial artery and vein.