To investigate the glomerular circuitry, visually guided single and paired recordings were obtained from glomerular neurons in rat olfactory bulb slices.
	Based on classical morphological studies there are 3 classes of glomerular neurons: external tufted (ET) cells, periglomerular (PG) cells and short axon (SA) cells, collectively referred to as “juxtaglomerular (JG) neurons”.
	In order to identify the neurons, physiologically characterized cells were filled with Lucifer Yellow and reconstructed.
	The first type of cell I will show is the ET cell.