Each spinal nerve is formed by the merging of two distinct roots that emerge from the spinal cord:
Before examining the peripheral nerves, we must start with the core. The spinal cord is a thick, whitish bundle of nervous tissue that runs from the brainstem down through the vertebral canal. It does fill the entire spinal column; in adults, it typically ends around the first or second lumbar vertebra (L1-L2). nerve diagram back
These two roots merge just outside the spinal cord to form the mixed spinal nerve. Each spinal nerve is formed by the merging
After exiting the intervertebral foramen, the mixed spinal nerve splits into three main branches: These two roots merge just outside the spinal
The nerve supply of the back is a layered system. The act as the local government, supplying the intrinsic muscles and skin directly adjacent to the spine, while the anterior rami act as the interstate highway system, forming plexuses that power the limbs. A detailed diagram illustrates how these systems overlap, providing a roadmap for clinicians to trace pain sources back to their nervous origins.