What are the sympathetic levels for the kidneys?

What are the sympathetic levels for the kidneys?

• A. T1-T4
• B. T10-L1
• C. L2-L4
• D. T5-T9

Answer: (B)

Sympathetic input to the kidneys comes from thoracolumbar spinal levels, specifically from T10 through L1. Preganglionic neurons reside in the intermediolateral cell column at these levels and send fibers via thoracic and lumbar splanchnic nerves to synapse in prevertebral ganglia or within the renal plexus around the renal arteries. Postganglionic fibers then travel with the renal vasculature to the kidney. This sympathetic outflow constricts renal vessels, reducing renal blood flow and glomerular filtration, and stimulates renin release from juxtaglomerular cells, helping regulate blood pressure. Hence the correct sympathetic level for the kidneys is T10 to L1.

Sympathetic input to the kidneys comes from thoracolumbar spinal levels, specifically from T10 through L1. Preganglionic neurons reside in the intermediolateral cell column at these levels and send fibers via thoracic and lumbar splanchnic nerves to synapse in prevertebral ganglia or within the renal plexus around the renal arteries. Postganglionic fibers then travel with the renal vasculature to the kidney. This sympathetic outflow constricts renal vessels, reducing renal blood flow and glomerular filtration, and stimulates renin release from juxtaglomerular cells, helping regulate blood pressure. Hence the correct sympathetic level for the kidneys is T10 to L1.