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Aspects of vertebrate gustatory phylogeny: Morphology and turnover of chick taste bud cells

Identifieur interne : 005F94 ( Istex/Curation ); précédent : 005F93; suivant : 005F95

Aspects of vertebrate gustatory phylogeny: Morphology and turnover of chick taste bud cells

Auteurs : Judith R. Ganchrow [Israël] ; Donald Ganchrow [Israël] ; Suzanne M. Royer [États-Unis] ; John C. Kinnamon [États-Unis]

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RBID : ISTEX:C0B1145752FFD6BE79636D4EC8C2642DCAC347B1

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English descriptors

Abstract

The taste bud is a receptor form observed across vertebrates. The present report compares chick taste buds to those of other vertebrates using light and electron microscopy. Unlike mammals, but common to many modern avians, the dorsal surface of chick anterior tongue lacks taste papillae and taste buds. Ultrastructurally, chick buds located in the anterior floor of the mouth (as in some reptiles and amphibians) and palate contain dark, intermediate, light, and basal cell types. Dark, intermediate, and light cells extend microvilli into intragemmal lumina and pores communicating with the oral cavity. As specialized features, dark cell apices lack dense granules and exhibit short microvilli relative to light and intermediate cells. Dark cell cytoplasmic fingers envelop intragemmal nerve fibers and cells as in other species, and sometimes contain abundant clear vesicles. Nerve profile expansions often are located adjacent to dark, intermediate, and light cell nuclei. Classical afferent synaptic contacts are rarely observed. Taste cell turnover is suggested by mitotic and degenerating figures in chick buds. In addition, tritiated thymidine injected into hatchlings, whose anterior mandibular oral taste bud population approximates that in adults, reveals a turnover rate of about 4.5 days. This is about half that observed in altricial mammals, reflecting a species difference or developmental factor in precocial avians. It is concluded that chick taste buds exhibit morphologic features common to other vertebrate buds with specializations reflecting the influences of niche, glandular relations, and/or age. © 1993 Wiley‐Liss, Inc.

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DOI: 10.1002/jemt.1070260204

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ISTEX:C0B1145752FFD6BE79636D4EC8C2642DCAC347B1

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<term>Anterior floor</term>
<term>Anterior mandibular</term>
<term>Anterior mandibular taste buds</term>
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<term>Apical regions</term>
<term>Axon</term>
<term>Background level</term>
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<term>Basal cells</term>
<term>Beidler</term>
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<term>Israel department</term>
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<term>Light microscopy</term>
<term>Longitudinal filaments</term>
<term>Lumen</term>
<term>Mammalian taste buds</term>
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<term>Microvilli</term>
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<term>Nerve fiber membrane</term>
<term>Nerve fibers</term>
<term>Nerve profile</term>
<term>Nerve profile expansion</term>
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<term>Nongemmal basal epithelium</term>
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<term>Oral biology</term>
<term>Oral cavity</term>
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<term>Reutter</term>
<term>Roper</term>
<term>Royer</term>
<term>Salivary gland duct</term>
<term>Shimamura</term>
<term>Single axonal profile</term>
<term>Smooth endoplasmic reticulum</term>
<term>Sodium cacodylate buffer</term>
<term>Steppe tortoise</term>
<term>Stratified epithelium</term>
<term>Synapse</term>
<term>Synaptic</term>
<term>Takeda</term>
<term>Taste buds</term>
<term>Taste cell turnover</term>
<term>Taste cells</term>
<term>Taste organ</term>
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<term>Toyoshima</term>
<term>Tritiated thymidine</term>
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<term>Turnover rate</term>
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<term>Afferent synapses</term>
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<term>Anterior floor</term>
<term>Anterior mandibular</term>
<term>Anterior mandibular taste buds</term>
<term>Apical</term>
<term>Apical regions</term>
<term>Axon</term>
<term>Background level</term>
<term>Basal</term>
<term>Basal cells</term>
<term>Beidler</term>
<term>Bud</term>
<term>Cell biol</term>
<term>Cell lineage</term>
<term>Cell tissue</term>
<term>Cell tissue kinet</term>
<term>Cell type</term>
<term>Cell types</term>
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<term>Chick taste buds</term>
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<term>Chorda tympani</term>
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<term>Filament bundle</term>
<term>Filament bundles</term>
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<term>Foliate papillae</term>
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<term>Graziadei</term>
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<term>Intragemmal lumen</term>
<term>Intragemmal lumina</term>
<term>Israel department</term>
<term>Kinnamon</term>
<term>Light cells</term>
<term>Light microscopy</term>
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<term>Lumen</term>
<term>Mammalian taste buds</term>
<term>Microvillar length</term>
<term>Microvilli</term>
<term>Mouse vallate taste buds</term>
<term>Necturus maculosus</term>
<term>Nerve endings</term>
<term>Nerve fiber membrane</term>
<term>Nerve fibers</term>
<term>Nerve profile</term>
<term>Nerve profile expansion</term>
<term>Nerve profiles</term>
<term>Neurol</term>
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<term>Oakley</term>
<term>Oral biology</term>
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<term>Pore</term>
<term>Pore region</term>
<term>Postinjection</term>
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<term>Postnatal days</term>
<term>Postnatal development</term>
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<term>Receptor cells</term>
<term>Reptile</term>
<term>Reutter</term>
<term>Roper</term>
<term>Royer</term>
<term>Salivary gland duct</term>
<term>Shimamura</term>
<term>Single axonal profile</term>
<term>Smooth endoplasmic reticulum</term>
<term>Sodium cacodylate buffer</term>
<term>Steppe tortoise</term>
<term>Stratified epithelium</term>
<term>Synapse</term>
<term>Synaptic</term>
<term>Takeda</term>
<term>Taste buds</term>
<term>Taste cell turnover</term>
<term>Taste cells</term>
<term>Taste organ</term>
<term>Taste organs</term>
<term>Taste pore</term>
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<term>Toyoshima</term>
<term>Tritiated thymidine</term>
<term>Turnover</term>
<term>Turnover rate</term>
<term>Ultrastructural</term>
<term>Ultrastructural organization</term>
<term>Ultrastructure</term>
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<term>Vallate papilla</term>
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<term>Vertebrate taste buds</term>
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<front>
<div type="abstract" xml:lang="en">The taste bud is a receptor form observed across vertebrates. The present report compares chick taste buds to those of other vertebrates using light and electron microscopy. Unlike mammals, but common to many modern avians, the dorsal surface of chick anterior tongue lacks taste papillae and taste buds. Ultrastructurally, chick buds located in the anterior floor of the mouth (as in some reptiles and amphibians) and palate contain dark, intermediate, light, and basal cell types. Dark, intermediate, and light cells extend microvilli into intragemmal lumina and pores communicating with the oral cavity. As specialized features, dark cell apices lack dense granules and exhibit short microvilli relative to light and intermediate cells. Dark cell cytoplasmic fingers envelop intragemmal nerve fibers and cells as in other species, and sometimes contain abundant clear vesicles. Nerve profile expansions often are located adjacent to dark, intermediate, and light cell nuclei. Classical afferent synaptic contacts are rarely observed. Taste cell turnover is suggested by mitotic and degenerating figures in chick buds. In addition, tritiated thymidine injected into hatchlings, whose anterior mandibular oral taste bud population approximates that in adults, reveals a turnover rate of about 4.5 days. This is about half that observed in altricial mammals, reflecting a species difference or developmental factor in precocial avians. It is concluded that chick taste buds exhibit morphologic features common to other vertebrate buds with specializations reflecting the influences of niche, glandular relations, and/or age. © 1993 Wiley‐Liss, Inc.</div>
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