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Updated: Aug 7, 2026

Visualization of Cortical Modules in Flattened Mammalian Cortices
Published on: January 22, 2018
The olfactory glomerulus: a cortical module with specific functions
Wei R Chen1, Gordon M Shepherd
1Department of Neurobiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06510, USA.
Abstract:
The axons of many olfactory receptor cells converge on an individual glomerulus in the olfactory bulb, where they make contacts with the distal dendrites of mitral and tufted cells. Each glomerulus is targeted by olfactory receptor neurons expressing a single type of olfactory receptor protein. The glomerulus provides a unique model in which the function of a cortical module can be unambiguously established. Here we review the increasing evidence that a key functional operation of the glomerulus is to act as a signal-to-noise enhancing device in the processing of sensory input and that this function is critical across vertebrate and invertebrate species for the ability to detect specific odor stimuli within "noisy" odor environments and to carry out discriminations between odor molecules that are structurally closely related.
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