Question

bundles of axons in the central nervous system are known as

horns.
\tnuclei.

tracts.

ganglia.

commissures.

Explanation:

In the central nervous system, bundles of axons are called tracts. Horns are parts of the spinal cord gray matter. Nuclei are clusters of neuron cell bodies in the CNS. Ganglia are clusters of neuron cell bodies in the PNS. Commissures are tracts that connect the two hemispheres of the brain.

Answer:

tracts.