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McKenzie branch linking the spinal accessory nerve to a ventral C1 rootlet. a shows accessory nerve in situ, b and c show accessory nerve reflected. Saylam et al. (2009a, b) (permission received from publisher for redistribution). C2 dorsal C2 root, dl denticulate ligament, SC spinal cord, va vertebral artery, XI pinal accessory. Asterisk anterior spinal medullary artery, nerve, Thin arrow McKenzie branch, Thick arrowheads ventral C1 rootlets
