Lumbosacral Plexus

The lumbosacral plexus is formed by the union of the anterior primary divisions of the lumbar, sacral, and coccygeal nerves. In about 50% of cases it receives a branch from the twelfth thoracic nerve. Its components are distributed to the lower extremity in a manner homologous and similar to the distribution of the parts of the brachial plexus to the upper limb. The lumbar nerves are distributed similarly to the nerves from the anterior (medial and lateral) cords of the brachial plexus, and the sacral nerves are distributed similarily to the nerves from the posterior cord of the brachial plexus.

Partly for convenience of description and partly because of the differences in position and course of some of the nerves arising from it, the lumbosacral plexus is subdivided into four parts: the lumbar, sacral, pudendal, and coccygeal plexuses. It must be remembered that these plexuses overlap and that there is no definite line of demarcation between their origins and distributions.

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