part of ends during starts during telencephalon death multi-tissue structure olfactory system olfactory bulb UBERON:0002264 Part of the telencephalon, comprising paired anterior outgrowths of either of the cerebral hemispheres in which the olfactory nerve exits. The olfactory bulbs begin to fuse at NF stage 50, and fusion is complete around NF stage 58. The cerebral vein loops around the olfactory bulb by NF stage 43. 2011-08-31T02:08:00Z lab olfactory lobe xenopus_anatomy OB bulbus olfactorius XAO:0004180 NF stage 26