Final answer:
The lumbar intervertebral disc includes the nucleus pulposus as its basic structure, which is crucial for resisting compression and bearing weight.
Step-by-step explanation:
The basic structure of the lumbar intervertebral disc includes the nucleus pulposus, which is a softer, gel-like material that has a high water content aiding in weight bearing and compression resistance. This is contrasted with the anulus fibrosus, which is the tough, fibrous outer layer of the disc that anchors it to the vertebral bodies. With aging, the water content in the nucleus pulposus reduces, leading to thinner discs, decreased flexibility, and a reduction in the range of motion.