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Here are the clues. Preceding each clue is the number of letters in the answer.

Clue 1: 11 letters. Myelinated axons
Clue 2: 5 letters. Myelinated axons in central nervous system
Clue 3: 5 letters. Myelinated axons in peripheral nervous system
Clue 4: 10 letters. Unmyelinated axons
Clue 5: 7 letters. Nerve cell bodies in central nervous system
Clue 6: 8 letters. Group of nerve cell bodies in peripheral nervous system