Anterior part of lumbar plexus

The anterior part of lumbar plexus is formed by the ventral divisions of the anterior rami of the lumbar spinal nerves L1–L4. The lumbar plexus itself originates from the anterior rami of the L1–L3 spinal nerves, along with a contribution from the anterior ramus of L4. Out of these, the anterior rami of the L2–L4 nerves each divide into ventral and dorsal divisions, while the anterior ramus of L1 has only a single trunk, referred to as its ventral division, as it does not give rise to a dorsal division. Together, these ventral divisions of the anterior rami constitute the anterior part of lumbar plexus.

Several important nerve branches arise from the anterior part of lumbar plexus.