348. Haberly LB, Hansen DJ, Feig SL and Presto S. (1987) Distribution and ultrastructure of neurons in opossum piriform cortex displaying immunoreactivity to GABA and GAD and high-affinity tritiated GABA uptake. J Comp Neurol 266:269-90 [Journal] .

NeuronCompartmentPropertyConnectivityNotes
Olfactory cortex anterior interneuron superficial layerAxon terminalGabaDistal apical dendrites of pyramidal cellsThe GABABR1a antibody selectively marked the neuropil in layer Ia, where afferent olfactory fibers and intrinsic GABAergic axons terminate on the distal apical dendrites of pyramidal neurons. GABABR1a may be involved in feedforward synaptic circuits (Princivalle A et al, 2000349 ). Horizontal cells in layer Ia are labelled for GAD and GABA, but not for GABA takeup, suggesting lack of local axon collaterals or high-affinity GABA takeup sites (Haberly LB et al, 1987348 ).
Olfactory cortex anterior interneuron superficial layerSomaGaba.Layer Ia horizontal cells receive a very small number of symmetrical synapses (presumably GABAergic?), in contrast to interneurons of the deeper layers of the piriform cortex -- globular, multipolar cells (Haberly LB et al, 1987348 ).
Olfactory cortex anterior interneuron deep layerSomaGabaGABAergic input?GABAergic interneurons in deeper layers of piriform cortex receive symmetric synapses as well as asymmetric synapses (Haberly LB et al, 1987348 ).
Olfactory cortex anterior interneuron deep layerProximal equivalent dendriteGabaGABAergic input?GABAergic interneurons in deeper layers of piriform cortex receive symmetric synapses as well as asymmetric synapses (Haberly LB et al, 1987348 ).

References
349. Princivalle A, Spreafico R, Bowery N and De Curtis M. (2000) Layer-specific immunocytochemical localization of GABA(B)R1a and GABA(B)R1b receptors in the rat piriform cortex. Eur J Neurosci 12:1516-20.
348. Haberly LB, Hansen DJ, Feig SL and Presto S. (1987) Distribution and ultrastructure of neurons in opossum piriform cortex displaying immunoreactivity to GABA and GAD and high-affinity tritiated GABA uptake. J Comp Neurol 266:269-90 [Journal] .
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