ArticleBrain sciences2025
The Bulb, the Brain and the Being: New Insights into Olfactory System Anatomy, Organization and Connectivity.
Article in Brain sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- Analysis of structural alterations in olfactory-related brain regions in patients with cognitive impairment and the correlation with olfactory function.Frontiers in aging neuroscience · 2026Article
- Intranasal VACV VR-1354 infection impairs chemosensory function and induces olfactory bulb neuroinflammation in mice.Frontiers in immunology · 2026Article
- Spatial and temporal mapping of early alphaherpesvirus invasion routes into the mouse central nervous system.Journal of neurovirology · 2025Article
- Anatomy-Guided Microsurgical Resection of a Dominant Frontal Lobe Tumor Without Intraoperative Adjuncts: A Case Report from a Resource-Limited Context.Diagnostics (Basel, Switzerland) · 2025Article
- [Depressive disorders and olfactory dysfunction].Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciencesReview
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Abstract
BACKGROUND/
objectivesOlfaction is in many ways the least understood sensory modality. Its organization and connectivity are still under debate. The aim of this study was to investigate the anatomy of the olfactory system by using a cadaver fiber dissection technique and in vivo tractography to attain a deeper understanding of the subcortical connectivity and organization.
methodsTen cerebral hemispheres were used in this study for white matter dissection according to Klingler's technique. Measurements of different cortical structures and interhemispheric symmetry were compared. Diffusion tensor imaging sequences from twenty-five healthy individuals from the Human Connectome Project dataset were used to explore the connectivity of the olfactory system using DSI Studio. White matter connectivity between the following were reconstructed in vivo: (1) Olfactory bulb to primary olfactory cortices; (2) Olfactory bulb to secondary olfactory cortices; (3) Primary to secondary olfactory cortices. The DTI metrics of the identified major associative, projection and commissural pathways were subsequently correlated with olfactory function and cognition in seventy-five healthy individuals with Spearman's rank correlation and the Benjamini-Hochberg method for false discoveries (CI 95%,
results1. The dissection showed that the lateral stria was significantly longer on the left side and projected towards the amygdala, the entorhinal and piriform cortex. 2. The medial stria was not evident as a consistent white matter structure. 3. Both dissection and tractography showed that major associative white matter pathways such as the uncinate fasciculus, the inferior fronto-occipital fasciculus and cingulum supported the connectivity between olfactory areas together with the anterior commissure. 4. No significant correlation was found between DTI metrics and sensory or cognition test results.
conclusionsWe present the first combined fiber dissection analysis and tractography of the olfactory system. We propose a novel definition where the primary olfactory network is defined by the olfactory tract/bulb and primary olfactory cortices through the lateral stria only. The uncinate fasciculus, inferior fronto-occipital fasciculus and cingulum are the associative pathways supporting the connectivity between primary and secondary olfactory areas together with the anterior commissure. We suggest considering these structures as a secondary olfactory network. Further work is needed to attain a deeper understanding of the pathological and physiological implications of the olfactory system.
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