Abstract
An embryonic olfactory bulb was heterotopically inserted and allowed to mature in young adult rat brains. The projection of the transplanted olfactory bulb to the host brain was examined by injections of peroxidase-labeled wheatgerm agglutinin into the host olfactory bulb (and anterior olfactory nucleus). Neurite elongation to the host olfactory area occurred most frequently from the transplant which had been inserted into the anterior horn of the lateral ventricle and fused medially with the lateral septum in host brains with no detectable damage of host olfactory connections. Transplants in the septum, olfactory tubercle, nucleus of the horizontal limb of the diagonal band, or anterior piriform cortex also showed the projection to the host olfactory area. These results indicate that the transplanted olfactory bulb projection neurons have potent abilities to detect the target and project to it even if there is a considerable distance (2–5 mm).
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