Final answer:
The lumbar plexus innervates the pelvic region and the anterior leg via axons from all lumbar spinal nerves, with the femoral nerve being a major nerve from this plexus.
Step-by-step explanation:
Lumbar Plexus Innervation
The lumbar plexus is a network of nerves that arises from the lumbar segments of the spinal cord. It provides innervation to various regions of the body, most notably the pelvic region and the anterior leg. The lumbar plexus is composed of axons from all the lumbar spinal nerves, and its major nerve is the femoral nerve. This nerve continues to give rise to the saphenous nerve, which extends through the anterior lower leg. It's important to note that the sciatic nerve, which involves the tibial nerve, extends from the sacral plexus, not the lumbar plexus, and is responsible for the posterior leg's innervation.