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ART FOR SCIENCE / SCIENCE PHOTO LIBRARY ART FOR SCIENCE / SCIENCE PHOTO LIBRARY
Spinal cord regions. Diagram of a sagittal section through the human skull and backbone, showing the five main regions of the spinal cord and the numbered nerves associated with them. The regions are colour-coded, from top to bottom: cervical (green), thoracic (orange), lumbar (purple), sacral (red), coccygeal (green). The spinal nerves branch out from the spinal cord to supply different regions of the body. They general ennervate adjacent areas, but sometimes can supply areas relatively far away, and trapped nerves in the neck and lower back can cause pain in the arms and legs. Humans have 31 spinal nerves.
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