Major splanchnic nerve
The nervus splanchnicus major ("great visceral nerve ", from Greek splanchnon " viscera ") is a nerve of the sympathetic nervous system . In humans it arises on both sides from the 5th to 9th breast segment of the spinal cord , in domestic animals from the 8th to the third from the last. Then to pull the nervous fibers, without change in the ganglia of the sympathetic trunk , parallel to the border with the right strand azygous vein , or the left with the vena hemiazygos through the diaphragm into the abdominal cavity .
The major splanchnic nerve runs to the prevertebral ganglia , especially the celiac ganglion . Only there are the nerve fibers switched to the second, postsynaptic neuron. In addition, fibers pull to the adrenal medulla .
The sympathetic nerve fibers act on the blood vessels and thus regulate the blood flow to the organs of the upper abdomen. They also have an inhibitory effect on the function of the gastrointestinal tract .
See also
literature
- Franz-Viktor Salomon: nervous system, systema nervosum . In: Salomon / Geyer / Gille (Hrsg.): Anatomy for veterinary medicine . Enke, Stuttgart 2004, pp. 464-577. ISBN 3-8304-1007-7