Lesser splanchnic nerve

Thoracic splanchnic nerves
The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses. (Greater and lesser splanchnic nerves labeled at left.)
Abdominal portion of the sympathetic trunk, with the celiac and hypogastric plexuses. (Greater splanchnic and lowest splanchnic labeled at upper left. Greater splanchnic and lesser splanchnic labeled at upper right.)
Details
From	thoracic ganglia
Identifiers
MeSH	A08.800.050.050.800
Anatomical terms of neuroanatomy []

Thoracic splanchnic nerves are splanchnic nerves that arise from the sympathetic trunk in the thorax and travel inferiorly to provide sympathetic innervation to the abdomen. The nerves contain preganglionic sympathetic and general visceral afferent fibers.

There are three main thoracic splanchnic nerves:

The nerve's origins can be remembered by the "4-3-2 rule", accounting for the number of ganglia giving rise to each nerve. However, different sources define the nerves in different ways, so this rule may not always be reliable.

Greater splanchnic nerve, seen in thoracic cavity seen from left side.

Diagram of efferent sympathetic nervous system.

Plan of right sympathetic cord and splanchnic nerves.

The celiac ganglia with the sympathetic plexuses of the abdominal viscera radiating from the ganglia.

Lower half of right sympathetic cord.

The relations of the viscera and large vessels of the abdomen. Seen from behind, the last thoracic vertebra being well raised.

Thoracic splanchnic nerves