Neurons, Nervous System, and Signal Transmission Practice Test

The sacral plexus is formed by the ventral rami of spinal nerves from L4 through S4. This set of roots gives rise to the nerves that supply the lower limb and perineal region, such as the sciatic and pudendal nerves. In some individuals, a contribution from L5 can join via the lumbosacral trunk, but the core roots are L4 to S4. The other options correspond to different regions: L1-L4 to the lumbar plexus, C1-C5 to the cervical plexus, and C5-T1 to the brachial plexus.