What is the function of the Cauda Equina?

The primary function of the Cauda Equina is to innervate the lower body, making the choice correct. The Cauda Equina is a bundle of spinal nerves and nerve roots located in the lower spine, specifically arising from the conus medullaris at around the L1-L2 vertebral level and extending downwards. This collection of nerves is responsible for transmitting sensory and motor signals to and from the pelvic organs, legs, and feet, thereby facilitating movement and sensation in the lower body. It plays a crucial role in activities such as walking and bladder control, ensuring that neurological messages are effectively communicated between the central nervous system and the body's lower extremities.

The other choices, while involving important functions related to the spine, do not accurately describe the specific role of the Cauda Equina. Supporting the spinal column, protecting the spinal cord, and facilitating spinal fluid circulation are functions attributed to different structures within the spine, like the vertebrae, the meninges, and the cerebrospinal fluid pathways, respectively.