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J Comp Neurol

Title:		Early formation of sexually dimorphic glomeruli in the developing olfactory lobe of the brain of the moth Manduca sexta
Author(s):		Rossler W; Tolbert LP; Hildebrand JG;
Address:		"ARL Division of Neurobiology, University of Arizona, Tucson 85721-0077, USA"
Journal Title:		J Comp Neurol
Year:		1998
Volume:		396
Issue:		4
Page Number:		415 - 428
DOI:
ISSN/ISBN:		0021-9967 (Print) 0021-9967 (Linking)
Abstract:		"The antennal lobes (ALs), the primary olfactory centers, of the moth Manduca sexta are sexually dimorphic. Only ALs of males possess the macroglomerular complex (MGC), the site of primary processing of information about the female's sex pheromone. To understand the development of identified, odor-specific olfactory glomeruli, we investigated the cellular events involved in the morphogenesis of the MGC by means of various fluorescence staining techniques and laser-scanning confocal microscopy. The MGC lies near the entrance of the antennal nerve into the AL of the adult male and comprises three glomeruli, the globular cumulus and two toroidal structures. The MGC forms during early stages of metamorphic adult development through a stereotyped sequence of coordinated changes in MGC-specific receptor axons, glial cells, and early-ingrowing projection neurons of the medial group of AL neurons. The MGC divisions are the earliest glomeruli to form in the male AL, and their basic organization is established within about 3 days after ingrowth of the first sensory axons. Despite their special anatomical features, the MGC glomeruli develop in a manner similar to that of the ordinary glomeruli. Comparison of the ALs of males and females reveals that two relatively large and early-developing glomeruli that are situated dorsolaterally in the female AL appear to be female-specific. Development of the sexually dimorphic glomeruli diverges immediately after the ingrowth of the first olfactory receptor axons, resulting in the formation of these large glomeruli in females and the MGC in males"
Keywords:		"Animals Axons/physiology/ultrastructure Female Male Manduca/*embryology Metamorphosis, Biological Microscopy, Confocal Morphogenesis Neuroglia/physiology/ultrastructure Neurons, Afferent/physiology/ultrastructure Olfactory Bulb/*embryology/growth & develo;"
Notes:		"MedlineRossler, W Tolbert, L P Hildebrand, J G eng P01-NS28495/NS/NINDS NIH HHS/ Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. 1998/07/03 J Comp Neurol. 1998 Jul 13; 396(4):415-28"