Answer :
The correct option is c. Anterior, L4-S4.
The left and right sacral plexuses are formed from the Anterior rami of spinal nerves L4-S4 and are located immediately inferior to the lumbar plexuses.
- The sacral plexus is formed by the anterior rami of the spinal nerves from L4 to S4.
- It is located immediately inferior to the lumbar plexus, which consists of the anterior rami of the spinal nerves from L1 to L4.
- The lumbar plexus, which is located superior to the sacral plexus, arises from all lumbar spinal nerves and supplies innervation to the pelvic region and the anterior leg.
- The sacral plexus provides motor and sensory nerves for the posterior thigh, most of the lower leg and foot, and part of the pelvis. Thus, the correct answer is c. Anterior, L4-S4.
