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Primer on the Olfactory Bulb and Antennal Lobe Brief comparative introduction of: • Neurons • Synaptic interactions Olfaction: common evolutionary problems… …common solutions The AL and OB: Macroscopic Relations Brain nerve I OB projects to various brain centers J. H. Martin, 1989 The Mammalian Sensory Epithelium L. Buck and R. Axel (1991) Cell 65, 175-187 Each olfactory receptor neuron (ORN) expresses only one gene coding an odorant receptor protein. Fascicles G. M. Shepherd, 2004 The Insect Sensory Epithelium OB Intrinsic (local) and Principle (output) Neurons Synaptic interactions within the OB glomeruli Synaptic interactions within the AL glomeruli AL’s cholinergic ORN input + + – GABAergic LN’s + AL glomerulus BMI-sensitive Receptors: D.2.2.1 D.2.3.1 D.2.3.3 PN (output) AL Intrinsic (local) and Principle (output) Neurons AL MB http://www.biozentrum.uni-wuerzburg.de/fileadmin/REPORT/GENET/genet010.htm + - + - + + LH
