• (a.) Of or pertaining to an internuncio. • (a.) Communicating or transmitting impressions between different parts of the body; -- said of the nervous system.
(in″tәr-nun´she-әl) transmitting impulses between two different parts.
In`ter·nun'cial adjective [ See Internuncio .] 1. Of or pertaining to an internuncio. 2. (Physiol.) Communicating or transmitting impressions between different parts of the body; -- said of the nervous system. Carpenter. 
Type: Term Pronunciation: in′tĕr-nun′sē-ăl Definitions: 1. Indicating a neuron functionally interposed between two or more other neurons. 2. Acting as a medium of communication between two organs. Synonyms: intercalary neuron
adjective, Latin inter = between, nuncius = messenger.
serving to announce or connect. · (of a nerve cell or a chain of nerve cells) serving to connect nerve fibers.