Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System: Sympathetic Division
These vary greatly in size and number, but there are usually four. A single median terminal ganglion (ganglion impar or coccygeal ganglion) is often found at the distal end of the sympathetic chain of ganglia on the proximal part of the coccyx. Variations in size and number of ganglia are greater in the sacral region than in the thoracic and lumbar regions.
The sympathetic chain of ganglia has been found terminating at the level of the second sacral nerve.
Image 77
References
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