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Neurosci Lett

Title:		Coarse topographic organization of pheromone-sensitive afferents from different antennal surfaces in the American cockroach
Author(s):		Nishino H; Watanabe H; Kamimura I; Yokohari F; Mizunami M;
Address:		"Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan. Electronic address: nishino@es.hokudai.ac.jp. Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan. Maxnet Co., Ltd., Tokyo 164-0001, Japan. Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan"
Journal Title:		Neurosci Lett
Year:		2015
Volume:		20150404
Issue:
Page Number:		35 - 40
DOI:		10.1016/j.neulet.2015.04.006
ISSN/ISBN:		1872-7972 (Electronic) 0304-3940 (Linking)
Abstract:		"In contrast to visual, auditory, taste, and mechanosensory neuropils, in which sensory afferents are topographically organized on the basis of their peripheral soma locations, axons of cognate sensory neurons from different locations of the olfactory sense organ converge onto a small spherical neuropil (glomerulus) in the first-order olfactory center. In the cockroach Periplaneta americana, sex pheromone-sensitive afferents with somata in the antero-dorsal and postero-ventral surfaces of a long whip-like antenna are biased toward the anterior and posterior regions of a macroglomerulus, respectively. In each region, afferents with somata in the more proximal antenna project to more proximal region, relative to the axonal entry points. However, precise topography of afferents in the macroglomerulus has remained unknown. Using single and multiple neuronal stainings, we showed that afferents arising from anterior, dorsal, ventral and posterior surfaces of the proximal regions of an antenna were biased progressively from the anterior to posterior region of the macroglomerulus, reflecting chiasmatic axonal re-arrangements that occur immediately before entering the antennal lobe. Morphologies of individual afferents originating from the proximal antenna matched results of mass neuronal stainings, but their three-dimensional origins in the antenna were hardly predictable on the basis of the projection patterns. Such projection biases made by neuronal populations differ from strict somatotopic projections of antennal mechanosensory neurons in the same species, suggesting a unique sensory mechanism to process information about odor location and direction on a single antenna"
Keywords:		Animals Arthropod Antennae/*physiology Male Neuropil/physiology Olfactory Receptor Neurons/*physiology Periplaneta/*physiology Pheromones/*physiology Antenna Glomerulus Insects Olfactory afferents Sex pheromone Topographic map;
Notes:		"MedlineNishino, Hiroshi Watanabe, Hidehiro Kamimura, Itsuro Yokohari, Fumio Mizunami, Makoto eng Research Support, Non-U.S. Gov't Ireland 2015/04/08 Neurosci Lett. 2015 May 19; 595:35-40. doi: 10.1016/j.neulet.2015.04.006. Epub 2015 Apr 4"