I often hear people say that lumbar disc herniation, but where is the lumbar disc? Can you give me a hint?

Lumbar intervertebral disc is located between two vertebral bodies and is a structure with hydrodynamic characteristics. It consists of nucleus pulposus, fibrous ring and cartilage plate, in which nucleus pulposus is the central part, fibrous ring is the peripheral part, surrounding nucleus pulposus, and cartilage plate is the upper and lower parts, which are directly connected with vertebral bone tissue. The thickness of the whole lumbar intervertebral disc is 8 mm ~10 mm.

Disc herniation is a frequently-occurring and common disease, which is mainly caused by a series of symptoms caused by stimulation or compression of spinal nerves and spinal cord, such as disc strain degeneration, fiber ring rupture or nucleus pulposus prolapse. It is mainly because all parts of lumbar intervertebral disc (nucleus pulposus, annulus fibrosus and cartilage plate), especially nucleus pulposus, are degenerated to varying degrees. Under the action of external factors, the annulus fibrosus of intervertebral disc ruptures, and the nucleus pulposus tissue protrudes (or protrudes) from the ruptured site to the back or the spinal canal, which leads to the stimulation or compression of adjacent spinal nerve roots, resulting in a series of clinical symptoms such as low back pain, numbness, and pain in one or both lower limbs.