Netter's Anatomy Practice Test

The nerves that move the muscles of the anterior and medial thigh come from the lumbar plexus, specifically the femoral nerve for the front thigh muscles and the obturator nerve for the inner thigh muscles. Both nerves arise from the ventral rami of L2 to L4, which are part of the lumbar plexus. The brachial plexus serves the upper limb, not the thigh. The lumbosacral plexus is larger and includes sacral contributions, but the essential innervation of these thigh muscles is through the lumbar plexus. The epidermis is not a neural network at all.