Lumbar vs sacral splanchnic
nerve
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Lumbar splanchnic nerve
Origin: The lumbar splanchnic nerves go from
the abdomen and pelvic areas to the lumbar spinal cord segments (typically
L1–L3).
Type: These nerves transmit sympathetic fibers from the spinal cord, as
well as occasionally sensory fibers.
Function: The lumbar splanchnic nerves innervate the intestines,
bladder, and reproductive organs, among other abdominal and pelvic organs. They
are involved in the control of blood vessels, glands, and smooth muscle in
these regions.
Ganglia: Within the prevertebral ganglia of the abdominal cavity, these
nerves may also synapse in other ganglia, such as the inferior mesenteric
ganglion.
Sacral splanchnic nerve
Origin: Sacral splanchnic nerves travel to the
pelvic area from the sacral spinal cord segments, which are typically S1–S4.
Type: From the spinal cord, these neurons transmit sympathetic fibers as
well as occasionally sensory fibers.
Function: Sacral splanchnic nerves serve to govern smooth muscle,
glands, and blood vessels via innervating pelvic organs such the bladder,
rectum, and reproductive organs.
Ganglia: These nerves may form synapses in the pelvic plexus, also
referred to as the inferior hypogastric plexus, and other pelvic ganglia.
|
|
Lumbar
splanchnic nerve |
Sacral
splanchnic nerve |
|
Location
of preganglionic neuron |
Lateral horn of gray matter of
Lumbar 1,2 spinal cord segment |
Lateral horn of gray matter of
Lumbar 1,2 spinal cord segment |
|
Sympathetic
ganglion |
Lumbar 1,2 |
Sacral 1-5 |
|
Collateral
Ganglion |
Inferior mesenteric ganglion |
Inferior mesenteric ganglion |
|
Form
Autonomic Plexus |
Superior hypogastric plexus |
Inferior hypogastric plexus |
|
Fibres |
Preganglionic Sympathetic Fibres and General visceral afferent fiber |
Preganglionic and
postganglionic fibres Sympathetic Fibres and General visceral afferent fiber |
|
Functions |
Innervate pelvic viscera and
vasculature |
The inferior
hypogastric plexus is a plexus of nerves that supplies the viscera of the
pelvic cavity. The inferior hypogastric plexus gives rise to the prostatic
plexus in males and the uterovaginal plexus in females |
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