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Taste Buds and Receptors

Taste Buds and Receptors

Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...

Olfactory Receptors: Location and Structure

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...

The Physiology of Taste

The Physiology of Taste

The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...

Gustation

Gustation

Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.

Conditioned Taste Aversion

Conditioned Taste Aversion

Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
A notable characteristic of conditioned taste aversion is that it often requires only a single...

The Tongue and Taste Buds

The Tongue and Taste Buds

The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.

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Related Experiment Video

Updated: Jul 3, 2025

Psychophysical Tracking Method to Assess Taste Detection Thresholds in Children, Adolescents, and Adults: The Taste Detection Threshold TDT Test

Psychophysical Tracking Method to Assess Taste Detection Thresholds in Children, Adolescents, and Adults: The Taste Detection Threshold TDT Test

Published on: April 21, 2021

Aging is associated with a modality-specific decline in taste.

Elizabeth B Brown, Evan Lloyd, Alfonso Martin-Peña

Biorxiv : the Preprint Server for Biology

|February 14, 2024

Summary

This summary is machine-generated.

Aging impairs taste in fruit flies, specifically sugar detection, mirroring Alzheimer's Disease (AD) effects. This suggests localized neural changes, not widespread neurodegeneration, underlie these sensory deficits.

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Related Experiment Videos

Last Updated: Jul 3, 2025

Psychophysical Tracking Method to Assess Taste Detection Thresholds in Children, Adolescents, and Adults: The Taste Detection Threshold TDT Test

Psychophysical Tracking Method to Assess Taste Detection Thresholds in Children, Adolescents, and Adults: The Taste Detection Threshold TDT Test

Published on: April 21, 2021

Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments

Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments

Published on: February 21, 2020

Generation and Culture of Lingual Organoids Derived from Adult Mouse Taste Stem Cells

Generation and Culture of Lingual Organoids Derived from Adult Mouse Taste Stem Cells

Published on: April 5, 2021

Area of Science:

Neuroscience
Gerontology
Molecular Biology

Background:

Chemosensory deficits are linked to aging and neurodegenerative diseases like Alzheimer's Disease (AD).
Understanding these deficits offers insights into aging and neurodegeneration mechanisms.
The fruit fly, *Drosophila melanogaster*, serves as a model to study aging and neurodegeneration, but taste aspects remain under-explored.

Approach:

Compared aged and young flies' responses to different tastants (sugars, fatty acids).
Used genetic manipulation to express amyloid-beta peptide in specific taste neurons.
Performed functional imaging of gustatory axon terminals and analyzed gene expression in taste neurons.

Key Points:

Aging caused modality-specific taste deficits, impairing sugar response but not fatty acid response.
Amyloid-beta expression in sweet-sensing neurons mimicked aging-related deficits, localizing the issue to gustatory neurons.
Transcriptome analysis revealed age-related gene expression changes, including reduced odorant-binding proteins in sugar-sensing neurons.

Conclusions:

Age-related taste decline appears localized to gustatory neurons and may involve signaling pathway-specific changes.
Amyloid-beta expression leads to reduced innervation in the taste center, suggesting distinct mechanisms for taste deficits in aging vs. AD models.
This study establishes a *Drosophila* model for investigating cellular deficits in neural function related to aging and AD.