part of develops from retina sensory organ cell interommatidial cell 2008-10-31T05:54:23Z The boundary between ommatidia is only a single cell wide, so each interommatidial cell is not part of any one repeating unit of organization of the retina. However, in some sources, they are included as part of ommatidia, with the repeating unit referred to as the ommatidial core. fly_anatomy.ontology inter-ommatidial cell FBbt:00007250 Cell which is part of the boundary between ommatidia. VFB:FBbt_00007250 interommatidial precursor cell