What does "A" represent?

A) Spinal nerves
B) Conus medullaris
C) Cervical enlargement
D) Filium terminale
E) Cauda equina

Cauda Equina

The cauda equina is a bundle of spinal nerves and spinal nerve rootlets below the end of the spinal cord, resembling a horse's tail, which distributes nerve roots to the lower limbs and pelvic organs.

Filium Terminale

The filium terminale is a slender filament of connective tissue that extends from the conus medullaris at the lower end of the spinal cord to the coccyx, anchoring the spinal cord in place.

Conus Medullaris

The tapered, lower end of the spinal cord, typically ending around the first lumbar vertebra.