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The sympathetic ganglia, or paravertebral ganglia, are autonomic ganglia of the sympathetic nervous system. Ganglia are 20,000 to 30,000 afferent and efferent nerve cell bodies that run along on either side of the spinal cord. Afferent nerve cell bodies bring information from the body to the brain and spinal cord, while efferent nerve cell ...
Presynaptic neurons traveling from the spinal cord terminate in the paravertebral ganglia (cervical, thoracic, lumbar, sacral) or the prevertebral ganglia. They synapse with either the postsynaptic neuron of the corresponding level of the spinal cord or ascend and descend to synapse at the lower or upper paravertebral ganglia, respectively.
There are two kinds of neurons involved in the transmission of any signal through the sympathetic system: pre-ganglionic and post-ganglionic. The shorter preganglionic neurons originate in the thoracolumbar division of the spinal cord specifically at T1 to L2~L3, and travel to a ganglion, often one of the paravertebral ganglia, where they synapse with a postganglionic neuron.
Presynaptic: lower thoracic ganglia: Prevertebral ganglia: Greater splanchnic nerve: T5–T9 or T10: Celiac ganglia: Lesser splanchnic nerve: T10–T11: Superior mesenteric ganglia and Aorticorenal ganglia: Least splanchnic nerve: T12: Renal plexus: Lumbar splanchnic nerves: L1–2: Inferior mesenteric ganglia, ganglia of intermesenteric and ...
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The cervical ganglia are paravertebral ganglia of the sympathetic nervous system. Preganglionic nerves from the thoracic spinal cord enter into the cervical ganglions and synapse with its postganglionic fibers or nerves. The cervical ganglion has three paravertebral ganglia:
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