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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.

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.

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,...

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 diffusion of...

Seasoning of Wood

Seasoning of Wood

Seasoning of wood is a crucial process aimed at reducing and stabilizing the moisture content within the wood to prevent future shrinkage, structural damage, or aesthetic issues once the wood is used in construction. Wood naturally swells when it absorbs moisture and contracts as it dries.
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...

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 exposure...

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Related Experiment Video

Updated: Jun 25, 2026

Testing for Odor Discrimination and Habituation in Mice

Testing for Odor Discrimination and Habituation in Mice

Published on: May 5, 2015

Mousy off-flavor: a review.

Eleanor M Snowdon¹, Michael C Bowyer, Paul R Grbin

¹School of Agriculture, Food and Wine, The University of Adelaide, PMB 1 Glen Osmond, SA 5064, Australia.

Journal of Agricultural and Food Chemistry

|August 31, 2006

Summary

This summary is machine-generated.

Mousy off-flavor in wine, caused by lactic acid bacteria or Dekkera/Brettanomyces yeast, can be economically damaging. Microbial metabolism and oxygen exposure appear crucial for its formation, though the exact mechanisms remain unclear.

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Area of Science:

Enology and microbiology
Wine quality and spoilage analysis

Background:

Mousy off-flavor significantly impacts wine quality and market value.
This defect is associated with specific microbial contaminants: lactic acid bacteria (LAB) and Dekkera/Brettanomyces yeast.
Three key compounds (2-ethyltetrahydropyridine, 2-acetyltetrahydopyridine, 2-acetylpyrroline) are known to cause mousy off-flavor.

Observation:

Both LAB and Dekkera/Brettanomyces yeast can produce mousy off-flavor compounds.
LAB can produce all three identified mousy off-flavor compounds, while Dekkera/Brettanomyces can produce at least two.
The precise reasons for mousy off-flavor development in some wines but not others are not fully understood.

Findings:

The precursors for mousy off-flavor compounds are naturally present in wine.
Microbial metabolism is strongly implicated as a key factor in off-flavor formation.
Oxygen appears to play a critical role in the development of mousy off-flavor caused by Dekkera/Brettanomyces.

Implications:

Understanding microbial metabolism and oxygen management is vital for preventing wine spoilage.
Further research is needed to elucidate the exact pathways and conditions leading to mousy off-flavor.
Preventative strategies targeting specific microbes and oxygen exposure could mitigate economic losses for wineries.