Source : Webster's Revised Unabridged Dictionary (1913)

Afferent \Af"fer*ent\, a. [L. afferens, p. pr. of afferre; ad +
   ferre to bear.] (Physiol.)
   Bearing or conducting inwards to a part or organ; -- opposed
   to {efferent}; as, afferent vessels; afferent nerves, which
   convey sensations from the external organs to the brain.

Source : WordNet®

afferent
     adj : of nerves and nerve impulses; conveying sensory information
           from the sense organs to the CNS; "afferent nerves";
           "afferent impulses" [ant: {efferent}]