Question

what is the name of the fatty substance that surrounds the axon of a neuron?
the corpus callosum
the neural plate
cones
myelin

Explanation:

Myelin is a fatty substance that surrounds and insulates the axon of a neuron. It helps in the faster transmission of electrical impulses along the axon. The corpus callosum is a structure in the brain that connects the two hemispheres. The neural plate is an embryonic structure that gives rise to the nervous system. Cones are photoreceptor cells in the retina of the eye.

Answer:

myelin