The Collaborative International Dictionary of English v.0.48:

Entoperipheral \En`to*pe*riph"er*al\, a. [Ento- + peripheral.]
   (Physiol.)
   Being, or having its origin, within the external surface of
   the body; -- especially applied to feelings, such as hunger,
   produced by internal disturbances. Opposed to
   epiperipheral.
   [1913 Webster]