The End Plate. This consists of a narrow zone of hyaline cartilage covering each surface of the vertebral body. The end plate, along with the annulus, is perforated by thousands of small holes through which the tissue fluid diffuses. The fluid diffuses both into and out of the disc.
Sclerosis is a condition where the density is significantly increased.
The lumbosacral spinal cord and nerve supply legs, pelvis, and bowel and bladder. Sensations from the feet, legs, pelvis, and lower abdomen are transmitted through the lumbosacral nerves and spinal cord to higher segments and eventually the brain.
Here is a picture of the spinal chord showing the areas: