part of start stage end stage telencephalon olfactory bulb olfactory lobe bulbus olfactorius Brain structure which is the paired anteriormost part of the telencephalon and are connected to the telencephalon by two tracts carrying secondary olfactory fibers. From Neuroanatomy of the Zebrafish Brain. The olfactory bulb is a paired structure. zebrafish_anatomy TAO:0000402 ZFA:0000402 olfactory system multi-tissue structure pharyngula:high-pec adult