Lumbosacral plexus
Encyclopedia
The anterior divisions of the lumbar nerves, sacral nerves, and coccygeal nerve
Coccygeal nerve
-Structure:The coccygeal nerve is the 31st spinal nerve. It arises from the sacral plexus, and its ventral ramus helps form the coccygeal plexus. It does not divide into a medial and lateral branch...

 form the lumbosacral plexus, the first lumbar nerve being frequently joined by a branch from the twelfth thoracic. For descriptive purposes this plexus is usually divided into three parts:
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