Amino acid transmitter candidates in various regions of the primary olfactory cortex following bulbectomy.

The effect of bulbectomy on amino acid levels in 5 regions of the rat primary olfactory cortex has been monitored. Glutamate levels were significantly lowered in the lateral olfactory tract only. In contrast, aspartate levels were significantly reduced in all regions except the periamygdaloid cortex. The results suggest transmitter heterogeneity of the tract fibres and confirm a likely transmitter role for aspartate for some tract terminals.