Final answer:
The femoral nerve is a major nerve that arises from the lumbar plexus, involved in motor and sensory functions of the thigh and anterior lower leg.
Step-by-step explanation:
A nerve that arises from the lumbar plexus is the femoral nerve. The lumbar plexus itself arises from all the lumbar spinal nerves and gives rise to nerves enervating the pelvic region and the anterior leg. The femoral nerve is particularly significant as it gives rise to the saphenous nerve, which extends through the anterior lower leg. In the context of this plexus, the femoral nerve plays an important role in motor and sensory functions of the thigh and the anterior lower leg.