Sympathetic Motor Innervation

Sympathetic motor innervation to the gastrointestinal tract decreases motility, peristalsis, sphincter muscle contraction, absorption, and glandular secretions, in addition to causing vasoconstriction. Sympathetic innervation to the gastrointestinal tract is accomplished via the following nerves:

Greater splanchnic nerve. Carries preganglionic sympathet-ics originating from the T5-T9 level of the spinal cord that most likely synapse in the prevertebral plexus (celiac and superior mesenteric ganglia or plexuses). Lesser splanchnic nerve. Carries preganglionic sympathet-ics originating from the T10-T11 level of the spinal cord that most likely synapse in the prevertebral plexus (celiac and superior mesenteric ganglia or plexuses).

Least splanchnic nerve. Carries preganglionic sympathetics from the T12 level of the spinal cord that most likely synapse in the prevertebral plexus (aorticorenal and inferior mesen-teric ganglia or plexuses).

Lumbar splanchnic nerve. Carries preganglionic sympathetics from the L1-L2 level of the spinal cord that most likely synapse in the prevertebral plexus (inferior mesenteric and inferior hypogastric ganglia or plexuses).

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