noun, plural: collateral ganglia
Any of the sympathetic ganglia located in front of the vertebral column, outside the sympathetic chain, close to the viscera and arteries. It is mainly involved in the innervation of abdominal and pelvic viscera.
The collateral ganglia are associated with the major ventral branches of the aorta. Hence, these ganglia are found near the origin of celiac artery (which are called celiac ganglia), and of the superior and inferior mesenteric arteries (called superior and inferior mesenteric ganglia, respectively).
Compare: paravertebral ganglion
See also: sympathetic ganglia