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In particular, the relationships of BDA\u2010labeled tufts with olfactory nerve (ON) terminals and processes of calbindin D\u201028K\u2010immunoreactive (CB\u2010IR) cells were investigated with confocal laser\u2010scanning light microscopic (CLSM) and electron microscopic (EM) analyses. CB\u2010IR cells were type 2 periglomerular cells that restricted their processes in the ON\u2010free (non\u2010ON) zone of the glomerulus and received few synapses from ON terminals. The mitral tufts varied in complexity, but individual branches were rather simple, smooth processes that bore some branchlets and spines and extended more or less in a straight line or a gentle curve rather than winding tortuously within glomeruli as though they did not consider the compartmental organization, which consisted of ON and non\u2010ON zones that interdigitated in a complex manner with one another. Conventional EM analysis revealed that both thin and thick, presumed proximal branches of mitral\/tufted cell dendritic tufts received asymmetrical synapses from ON terminals. Correlated CLSM\u2010EM analysis confirmed direct contacts between the BDA\u2010 and CB\u2010labeled processes detected in the CLSM examinations, and synapses were recognized at some of those sites. Furthermore, ON terminals and CB\u2010IR processes were distributed on both proximal and distal dendritic branches in a more or less mosaic pattern. These findings revealed that, on the mitral dendritic tufts, ON terminals and processes of type 2 periglomerular neurons were not clearly segregated proximodistally but, rather, were arranged in a mosaic pattern, which may be important in fine tuning the output from individual glomeruli. J. Comp. Neurol. 440:219\u2013235, 2001. \u00a9 2001 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/cne.1381","type":"journal-article","created":{"date-parts":[[2002,10,6]],"date-time":"2002-10-06T11:25:39Z","timestamp":1033903539000},"page":"219-235","source":"Crossref","is-referenced-by-count":41,"title":["Structure of intraglomerular dendritic tufts of mitral cells and their contacts with olfactory nerve terminals and calbindin\u2010immunoreactive type 2 periglomerular 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