Cauda equina syndrome is best described as injury to which structure?

• A. Nerve roots at the lower end of the spinal cord causing bowel and bladder dysfunction
• B. Brain stem
• C. Cervical spinal cord
• D. Peripheral nerves of the limbs

Answer: (A)

Cauda equina syndrome describes injury to the nerve roots at the lower end of the spinal cord—the cauda equina. These roots descend below the conus medullaris in the lumbar region and include fibers that control the pelvic organs as well as sensation in the saddle area. When these nerve roots are damaged, the result is loss of sensation in the saddle region and dysfunction of bowel and bladder due to disruption of autonomic pathways (S2–S4), often with leg weakness and altered reflexes. This differentiates it from injuries to higher centers like the brain stem or cervical spinal cord, or from peripheral limb nerves, because the critical issue is damage to these lower spinal nerve roots that govern pelvic organ function.