Source : Webster's Revised Unabridged Dictionary (1913)

Innervation \In`ner*va"tion\, n. [Cf. F. innervation.]
   1. The act of innerving or stimulating.

   2. (Physiol.) Special activity excited in any part of the
      nervous system or in any organ of sense or motion; the
      nervous influence necessary for the maintenance of
      life,and the functions of the various organs.

   3. (Anat.) The distribution of nerves in an animal, or to any
      of its parts.

Source : WordNet®

innervation
     n 1: the neural or electrical arousal of an organ or muscle or
          gland [syn: {excitation}, {irritation}]
     2: the distribution of nerve fibers to an organ or body region