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Least splanchnic nerve (anatomy)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

The least splanchnic nerves are paired structures on either side of the spinal column. They are formed from:

preganglionic sympathetic fibres of spinal segments T11 and T12 which pass through the eleventh and twelfth ganglia of the sympathetic trunk without synapsing
afferent fibres from abdominal viscera

Beyond the ganglia, the nerves descend in the posteroinferior part of the thorax to pierce the diaphragm through the crura at the level of L1. Within the abdomen, the least splanchnic nerves synapse with postganglionic fibres within the renal ganglion, a subdivision of the coeliac ganglion around the renal artery.

Thoracic splanchnic nerves (anatomy)

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Least splanchnic nerve (anatomy)

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