Final answer:
The lumbar plexus is made up of the lumbar roots, specifically from all the lumbar spinal nerves, and gives rise to nerves like the femoral and saphenous nerves.
Step-by-step explanation:
The roots that make up the lumbar plexus are the lumbar roots. Specifically, the lumbar plexus arises from all the lumbar spinal nerves. It is responsible for enervating the pelvic region and the anterior leg, with the femoral nerve being one of its major nerves. A branch of the femoral nerve is the saphenous nerve, which extends through the anterior lower leg. Contrarily, the cervical plexus comprises axons from spinal nerves C1 through C5, and the sacral plexus is derived from the lower lumbar nerves L4 and L5 in conjunction with the sacral nerves S1 to S4.The lumbar plexus arises from all the lumbar spinal nerves and gives rise to nerves enervating the pelvic region and the anterior leg. One of the major nerves from this plexus is the femoral nerve, which gives rise to the saphenous nerve as a branch that extends through the anterior lower leg.