Biology / Unit 12 Bio 2851 short lesson, about 20 seconds
Spinal Cord: Gray and White Matter
Captions available
The idea
The spinal cord's cross section shows gray matter, holding neuron and interneuron cell bodies, surrounded by white matter, holding myelinated axons that carry signals to and from the brain.
In practice
Dorsal cord regions carry mostly sensory information toward the brain; ventral regions carry mostly motor signals away.
Where people slip
Spinal nerves do not regenerate on their own once severed, unlike some peripheral tissue.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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