radic/o, radicul/o or rhiz/o is a combining form that refers to “nerve root”.
A nerve root is a branch that is located at the end of a spinal nerve, cranial nerve, or spinal nerve. Nerve roots come in two types: cranial and spinal. Movement and feeling are stimulated by spinal nerve roots. Cranial nerves send electrical signals from your brain to your face, neck, and torso. Senses such as taste, smell, hearing, and touch are also mediated by the cranial nerves.