The anterior divisions of the lumbar nerves, sacral nerves, and coccygeal nerve 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: Injuries to the lumbosacral plexus are predominantly witnessed as bone injuries.

Lumbosacral trunk and sacral plexus palsies are common injury patterns.

[1] This article incorporates text in the public domain from page 948 of the 20th edition of Gray's Anatomy (1918)

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