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celiac ganglion n.
Any of the largest and highest group of sympathetic prevertebral ganglia, on the upper part of the abdominal aorta on either side of the celiac artery, containing the sympathetic neurons whose unmyelinated postganglionic axons innervate the stomach, liver, gallbladder, spleen, kidney, small intestine, and the ascending and transverse colon. Also called semilunar ganglion, solar ganglion.