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.

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 deep layerAxon terminalGabaonto pyramidal neuronInhibition of deep neurons (pyramidal and multipolar) by (presumed?) deep layer interneurons involves a fast Chloride and a slow potassium-mediated IPSP (Tseng GF and Haberly LB, 1989350 ). Different GABAergic receptors are localized to specific layers, and may mediate feedforward and feedback inhibitions (Princivalle A et al, 2000349 ). Cholinergic agonist carbachol caused a significant suppression of inhibitory postsynaptic potentials (IPSPs) in the pyramidal neurons that were induced by stimulation of layer Ib, with a weaker effect on IPSPs induced by stimulation of layer Ia (Patil MM and Hasselmo ME, 1999341 ). Dendritic GABAA-mediated IPSPs act largely independent of somatic IPSPs and may regulate facilitation of MNDA-mediated respnses (Kanter ED et al, 1996356 ).

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] .
350. Tseng GF and Haberly LB. (1989) Deep neurons in piriform cortex. I. Morphology and synaptically evoked responses including a unique high-amplitude paired shock facilitation. J Neurophysiol 62:369-85.
341. Patil MM and Hasselmo ME. (1999) Modulation of inhibitory synaptic potentials in the piriform cortex. J Neurophysiol 81:2103-18 [Journal] .
356. Kanter ED, Kapur A and Haberly LB. (1996) A dendritic GABAA-mediated IPSP regulates facilitation of NMDA-mediated responses to burst stimulation of afferent fibers in piriform cortex. J Neurosci 16:307-12.
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