Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Ageusia

  • Maryellen RomeroEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_696

Definition

Ageusia is the loss of the sense of taste. The disorder should be distinguished from a disruption in the ability to perceive flavor, which requires a combination of olfactory, gustatory, and somatosensory functions. Frequently, complaints of ageusia are often explained by olfactory dysfunction rather than a disruption in taste perception, per se. The majority of taste receptors (buds) are located on the tongue and this information is carried by the VIIth (anterior two thirds) and IXth (posterior third) cranial nerves, with other taste receptors (cranial nerve X) located in other regions of the mouth and throat. These taste fibers enter the solitary nucleus (rostral portion) in the upper medulla and from there second-order neurons travel to the ventral posterior medial nuclei of the thalamus. Thalamic projections carrying this gustatory information then project to the postcentral gyrus in the region of the parietal operculum and to the underlying insular cortex where the...

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References and Readings

  1. Cerf-Ducastel, B., Van de Moortele, P. F., MacLeod, P., Le Bihan, D., & Faurion, A. (2001). Interaction of gustatory and lingual somatosensory perceptions at the cortical level in the human: A functional magnetic resonance imaging study. Chemical Senses, 26(4), 371–383.PubMedCrossRefGoogle Scholar
  2. Doty, R. L., & Kimmelman, C. P. (1992). Lesser20R.P. Smell and taste and their disorders. In A. K. Asbury, G. M. McKhann, & W. I. McDonald (Eds.), Diseases of the nervous system (2nd ed., pp. 390–403). Philadelphia: W.B. Saunders.Google Scholar
  3. Wilson-Pauwek, L., Akesson, E., & Stewart, P. (1988). Cranial nerves: Anatomy and clinical comments. Philadelphia: B.C. Decker.Google Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Psychiatry and Behavioral SciencesTulane University School of MedicineNew OrleansUSA