University of Central Florida (UCF) ZOO3733C Human Anatomy Practice Test 4

The lesser splanchnic nerve is responsible for supplying sympathetic innervation to the jejunum. It carries preganglionic sympathetic fibers that originate from the spinal cord segments T10 and T11, which then synapse in the superior mesenteric ganglion. From there, postganglionic fibers extend to innervate the jejunum and other parts of the midgut.

This specific pathway is important as it reflects the intricate network of sympathetic innervation responsible for regulating gastrointestinal functions, such as motility and blood flow. The lesser splanchnic nerve is thus central in modulating these activities within the jejunum, aligning with its physiological role in digestion and absorption processes.