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Olfaction written in bone: Cribriform plate size parallels olfactory receptor gene repertoires in Mammalia Project ID: 00000C415 Public
68 Media · 25 Specimens · Managed by: Deborah Bird

The evolution of mammalian olfaction is manifested in a remarkable diversity of gene repertoires, neuroanatomy, and skull morphology across living species. Olfactory receptor genes (ORG), which initiate the conversion of odorant molecules into odor perceptions and help an animal resolve the olfactory world, range in number from a mere handful to several thousand genes across species. Within the snout, each of these ORGs is exclusively expressed by a discrete population of olfactory sensory neurons (OSN), suggesting that newly evolved ORGs may be coupled with new OSN populations in the nasal epithelium. Because OSNs axon bundles leave high-fidelity perforations (foramina) in the bone as they traverse the cribriform plate (CP) to reach the brain, we predicted that taxa with larger ORG repertoires would have proportionately expanded footprints in the CP foramina. We report here a striking linear correlation between relative CP area and number of functional ORGs across species from all mammalian superorders. This correlation suggests strong developmental links in the olfactory pathway between genes, neurons, and skull morphology. Furthermore, because ORG number is known to be linked to olfactory discriminatory function, the correlation found here supports relative CP size as a viable metric for inferring olfactory capacity across modern and extinct species.

Filtering by: Organization Museum of Vertebrate Zoology (MVZ) Mammal Collection (Arctos) Remove constraint Organization: Museum of Vertebrate Zoology (MVZ) Mammal Collection (Arctos)
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  ID Part Object Taxonomy Type Date Added Publication Status  
000045576 Cribiform Plate MVZ:Mamm:MVZ:Mamm:179796 Sorex araneus Image 2018-04-16 Restricted Download  
000045575 Cribiform Plate MVZ:Mamm:MVZ:Mamm:179796 Sorex araneus Volumetric Image Series 2018-04-16 Restricted Download  
000045560 Cranium MVZ:Mamm:MVZ:Mamm:116834 Pteropus vampyrus malaccensis Image 2018-04-16 Restricted Download  
000045559 Cranium MVZ:Mamm:MVZ:Mamm:116834 Pteropus vampyrus malaccensis Volumetric Image Series 2018-04-16 Restricted Download  
000045549 Cribiform Plate MVZ:Mamm:MVZ:Mamm:42613 Ochotona princeps princeps Image 2018-04-13 Restricted Download  
000045548 Cribiform Plate MVZ:Mamm:MVZ:Mamm:42613 Ochotona princeps princeps Volumetric Image Series 2018-04-13 Restricted Download  
000045547 Cribiform Plate MVZ:Mamm:MVZ:Mamm:116834 Pteropus vampyrus malaccensis Image 2018-04-13 Restricted Download  
000045546 Cribiform Plate MVZ:Mamm:MVZ:Mamm:116834 Pteropus vampyrus malaccensis Volumetric Image Series 2018-04-13 Restricted Download  
000044845 Cribiform Plate MVZ:MAMM:MVZ:MAMM:106555 Homo sapiens Volumetric Image Series 2018-03-29 Restricted Download  
000044846 Cribiform Plate MVZ:MAMM:MVZ:MAMM:106555 Homo sapiens Image 2018-03-29 Restricted Download  
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