Spinal level for the least splanchnic nerve:

Spinal level for the least splanchnic nerve:

• A. T11-T12
• B. T9
• C. T8
• D. T12

Answer: (D)

The question tests where the least splanchnic nerve originates and how it reaches its target. The nerve carries preganglionic sympathetic fibers from the lowest thoracic level, traveling with the diaphragm’s crura and passing through the aortic hiatus into the abdomen. It then typically synapses in the aorticorenal (renal) ganglia around the renal arteries to form the renal plexus. Thus the spinal level of origin is the last thoracic segment, T12. This distinguishes it from the greater and lesser splanchnic nerves, which arise higher up and serve other prevertebral targets.

The question tests where the least splanchnic nerve originates and how it reaches its target. The nerve carries preganglionic sympathetic fibers from the lowest thoracic level, traveling with the diaphragm’s crura and passing through the aortic hiatus into the abdomen. It then typically synapses in the aorticorenal (renal) ganglia around the renal arteries to form the renal plexus.

Thus the spinal level of origin is the last thoracic segment, T12. This distinguishes it from the greater and lesser splanchnic nerves, which arise higher up and serve other prevertebral targets.