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Sensory‐dependent asymmetry for a urine‐responsive olfactory bulb glomerulus
Author(s) -
Oliva Anthony M.,
Jones Kevin R.,
Restrepo Diego
Publication year - 2008
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.21800
Subject(s) - glomerulus , olfactory bulb , neuropil , olfactory system , sensory system , biology , neuroscience , anatomy , odor , olfaction , sensory deprivation , central nervous system , endocrinology , kidney
An unusual property of the olfactory system is that sensory input at the level of the first synapse in the olfactory bulb takes place at two mirror‐image glomerular maps that appear identical across the axis of symmetry. It is puzzling how two identical odor maps would contribute to sensory function. The functional units in these maps are the glomeruli, ovoid neuropil structures formed by axons from olfactory sensory neurons expressing the same olfactory receptor. Here we find that the genetically identified P2 glomeruli are asymmetric across the axis of symmetry in terms of responsiveness to urine volatiles and neuroanatomical structure. Furthermore, P2 asymmetry is modified by sensory deprivation and abolished by decreased BDNF levels. Thus, while mirror odor maps show symmetry at the macroscopic level in maps encompassing the entire surface of the olfactory bulb, they display asymmetry at the level of the single glomerulus. J. Comp. Neurol. 510:475–483, 2008. © 2008 Wiley‐Liss, Inc.