Journal ArticleDOI
Distribution and ultrastructure of taste buds in the oropharyngeal cavity of the rainbow trout, Salmo gairdneri Richardson
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The distribution, external surface morphology and ultrastructure of taste buds in the oropharyngeal cavity of the rainbow trout were studied using scanning and transmission electron microscopes to suggest the existence of two pathways for the transmission of gustatory sensation to the central nervous system (CNS).Abstract:
The distribution, external surface morphology and ultrastructure of taste buds in the oropharyngeal cavity of the rainbow trout, Salmo gairdneri Richardson, were studied using scanning and transmission electron microscopes (SEM and TEM). The SEM revealed three taste bud types, varying only in their degree of elevation from the general level of the epithelium. Types I and II were located on elevated papillae associated with teeth on the dentary, maxilla, palate, tongue and pharyngeal pads while the unelevated Type III were mainly found in the anterior (branchial) pharynx.
Each taste bud was composed of four cell types: basal, dark, intermediate and light cells, the apical processes of the last three filling the taste pores. The intermediate and light cells appeared similar in ultrastructure, varying only in the amount and organization of smooth endoplasmic reticulum (SER) in their cytoplasm. In addition to its contacts with the processes of intragemmal nerves distally, the basal cells established independent contacts with processes of extragemmal nerves basally. It is suggested that the distribution of the taste buds and their close association with teeth are adaptations to the predatory feeding habit of the rainbow trout. Age differences may account for the existence of two types of gustatory cells and the manner of innervation of the taste bud suggests the existence of two pathways for the transmission of gustatory sensation to the central nervous system (CNS).read more
Citations
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Journal ArticleDOI
The diversity of chemical stimulation in fish olfaction and gustation
TL;DR: Gustation Morphological basis an overview Taste buds Gustatory nerves and central projections Recordings of gustatory responses Responses to chemical stimuli Amino acids Carboxylic acids Nucleotides Bile salts CO2 and pH Toxins and other compounds Future prospects and research needs.
Journal ArticleDOI
Taste bud development in the zebrafish, Danio rerio
TL;DR: In zebrafish, the ontogenetic processes of taste bud formation differ from regenerative processes described in the literature, and this paper examines the development of taste buds on the light microscope and scanning and transmission electron microscopical levels.
Book ChapterDOI
Structural, histochemical and functional aspects of the epidermis of fishes
TL;DR: The histology, histochemistry (including lectin- and immunohistochemistry) and function of the epidermis of various teleosts and cyclostomes is surveyed in the light of the new data.
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Gustatory responses of the rainbow trout (Salmo gairdneri) palate to amino acids and derivatives
TL;DR: Gustatory responses to amino acids and derivatives obtained from the palatine nerve (VIIth cranial nerve) of rainbow trout were studied, demonstrating that the facial taste system is more narrowly-tuned to amino acid stimuli than the olfactory system.
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The Physiology of Taste in Fish: Potential Implications for Feeding Stimulation and Gut Chemical Sensing
TL;DR: Improvements in understanding the molecular basis of taste physiology in fish could open new opportunities to optimize feeding performance in aquaculture, particularly relevant at a time when alternative ingredients are being used, often reducing the digestibility and acceptability of fish diets, even if they are nutritionally balanced.
References
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Journal ArticleDOI
THE USE OF LEAD CITRATE AT HIGH pH AS AN ELECTRON-OPAQUE STAIN IN ELECTRON MICROSCOPY
TL;DR: The stain reported here differs from previous alkaline lead stains in that the chelating agent, citrate, is in sufficient excess to sequester all lead present, and is less likely to contaminate sections.
Journal ArticleDOI
Renewal of cells within taste buds
TL;DR: These studies suggest that the cells within the taste bud, as well as the nerves, undergo considerable change with time, and Corresponding changes in function are considered.
Journal ArticleDOI
Electron microscope observations on chemo-and mechano-receptor cells of fishes.
TL;DR: Three main types of neuroepithelial junctions connecting receptor cells with the central nervous system are described and well developed “sensory hairs” which consist of cilia and microvilli are described in neuromast receptor-cells.
Journal ArticleDOI
Cell specialization and sensory function in fish epidermis
TL;DR: Electron microscopy has been used to identify isolated chemosensory cells scattered in the oral epithelium and in the external epidermis of four teleosts, assuming that on the body they are innervated from spinal nerves and hence belong to the common chemical sense.
Journal ArticleDOI
The ultrastructure of taste and touch receptors of the Frog's taste organ
Monika von Düring,K. H. Andres +1 more
TL;DR: The taste buds from fungiform papillae and the hard palate of frogs were investigated with the scanning and transmission electron microscopes and the occurrence of two types of receptors explains physiological results.