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Schematic drawing of superficial cervical nerve block anesthesia. The needle entry point is located at the posterior border of the sternocleidomastoid muscle, at the midpoint of the line connecting the tip of the mastoid process to the transverse process of the C6 vertebra. The depth of needle insertion was 1.0–1.5 cm. Using the “fan” -shaped manner, local anesthetics were injected 2-3 cm above and below the needle insertion site.
