part of start stage end stage external cellular layer Portion of tissue which is located between the glomerular layer and internal cellular layer of the olfactory bulb, and contains large mitral cells whose efferent axons form most of the lateral and medial olfactory tracts. From Neuroanatomy of the Zebrafish Brain. zebrafish_anatomy TAO:0000352 ZFA:0000352 stratum cellulare externum bulbi olfactorii olfactory bulb portion of tissue unknown adult