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Anesthesia & Analgesia. 134(6):1308-1317, June 2022
The subparaneural upper trunk block is performed in the supraclavicular fossa, at the site where the upper trunk has trifurcated into anterior and posterior divisions and the suprascapular nerve. Local anesthetic is injected inside the paraneural sheath between either anterior and posterior divisions or posterior division and the suprascapular nerve.