afferent has 2 distinct synonyms spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is efferent.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a nerve that passes impulses from receptors toward or to the central nervous system
of nerves and nerve impulses; conveying sensory information from the sense organs to the CNS
“afferent nerves”
Synonyms, antonyms and the broader and narrower relations for afferent come from Princeton University’s WordNet. Full sources and licences.