01 / Location & anatomical relationships
Inside the protective canal formed by the vertebrae.
02 / Structure & organization
Central gray matter forms horns surrounded by white-matter tracts. Sensory fibers enter through dorsal roots, and motor fibers leave through ventral roots. In adults, the cord usually ends near the upper lumbar vertebral region.
03 / Function
Messages travel through it between your brain and body.
04 / Mechanism
Bundles of nerve fibers carry signals upward and downward. Some connections within the cord also produce quick reflex responses. For example, a withdrawal reflex can begin before the brain fully interprets a painful touch.
Working together: nervous system
When you reach for a ball, your eyes send information to your brain. Your brain sends instructions through nerves to the muscles in your arm.
Meet this body system →FOR DEEPER STUDY
Connect structure with function
The spinal cord is shorter than the vertebral canal. Lower nerve roots continue downward as the cauda equina before exiting, so cord segments and vertebral levels do not always align.
Check your understanding
Locate the spinal cord in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Further reading: NINDS: Know Your Brain.
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.