What are dorsals?

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Dorsal rhizotomy-- A surgical procedure that cuts nerve roots to reduce spasticity in affected muscles.

A dorsal Stripe is a dark brown/black stripe that goes straight down the back of a horse. Duns have them, But usually not paint duns.

The roots are two split bases of spinal nerves that connect to the spinal cord. The rami are branches of the spinal nerve that form a complex system throughout the body with the two primary ones...

There's no such thing.