Between nerve cell groups in the brain or retina. ... (05 Mar 2000) ... 
(in″tәr-noo´kle-әr) situated between nuclei or between nuclear layers of the retina.
Type: Term Pronunciation: in′tĕr-nū′klē-ăr Definitions: 1. Between nerve cell groups in the brain or retina.
internuclear 1. Located or occurring between nuclei. 2. Pertaining to or affecting structures between nuclei, as internuclear ophthalmoplegia. 3. Between the nuclear layers of the retina.