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Lumbosacral trunk

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Nerve: Lumbosacral trunk
Gray822
Plan of lumbar plexus.
Gray829
Dissection of side wall of pelvis showing sacral and pudendal plexuses.
Latin truncus lumbosacralis
Gray's subject #212 948
Innervates {{{Innervates}}}
From L4-L5
To {{{BranchTo}}}
MeSH [1]

The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus.

Structure

The lumbosacral trunk comprises the whole of the anterior division of the fifth and a part of that of the fourth lumbar nerve; it appears at the medial margin of the psoas major and runs downward over the pelvic brim to join the first sacral nerve.

The anterior division of the third sacral nerve divides into an upper and a lower branch, the former entering the sacral plexus and the latter the pudendal plexus.

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