Three Dimensional Observations on the Taste Buds in Rabbits

Shimamura, Akitatsu; Kawano, Takaaki; Kimura, Toshio

doi:10.1679/aohc1950.28.471

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…Figure 11B and 11C also shows that this taste bud had three taste pores. Taste buds with more than one apical pore are not uncommon in rabbit taste buds (Engstrom and Rytzner, 1956a,b;Heidenhain, 1914;Murray, 1973;Shimamura et al, 1967). Among nearly 60 taste buds surveyed in serial sections, approximately one third had more than one taste pore, with a single bud possessing as many as four apical pores.…”

Section: Foliate Taste Buds Of the Rabbitmentioning

confidence: 99%

Application of serial sectioning and three‐dimensional reconstruction to the study of taste bud ultrastructure and organization

Royer

Kinnamon

1994

Microscopy Res & Technique

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The lingual taste buds of mammals are complex organs containing dozens of cells of varying morphology and numerous nerve fibers that are intermingled among the cellular processes. Some of the taste bud cells form synaptic contacts with these nerve fibers. Important questions remain to be answered regarding the structure and function of the cells of various types within taste buds and the means by which responses to gustatory stimuli are transmitted to the nerve fibers that communicate with the brain. Using both conventional and high voltage electron microscopy, we have examined serially sectioned taste buds from the tongues of mice and rabbits in order to address these issues and to obtain more complete information than that available from sampling of sections. The technique of computer-assisted 3-D reconstruction was used to generate models of whole taste buds and individual cellular and neural elements within taste buds from the serial sections. Analysis of serially sectioned taste buds from mice and rabbits has revealed that in both of these species relatively few (30% or less) of the cells within the taste buds form synaptic contacts with nerve fibers. In the foliate taste buds of rabbits, all of the cells that are presynaptic to nerve fibers are of a single morphological type (type III). The cells that are presynaptic to nerve fibers within the taste buds of mice are morphologically diverse. A pattern of synaptic connectivity exists within murine taste buds such that a given nerve fiber receives synaptic input only from taste cells that are ultrastructurally similar. In the taste buds of both mice and rabbits, we have observed both divergence and convergence of synaptic input from the putative taste receptor cells onto nerve fibers, suggesting that at the level of the taste bud there is some integration of the information generated by individual receptor cells. In addition to typical chemical synapses, other cytoplasmic specializations (such as subsurface cisternae and atypical mitochondria) may be involved in interactions between taste bud cells and nerve fibers.

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Section: Foliate Taste Buds Of the Rabbitmentioning

confidence: 99%

Application of serial sectioning and three‐dimensional reconstruction to the study of taste bud ultrastructure and organization

Royer

Kinnamon

1994

Microscopy Res & Technique

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“…Although an earlier light-microscopic study suggested the presence of dividing cells associated with rabbit taste buds (Shimamura et al, 1967), it could not be deter-mined if such cells were peripheral precursor cells or were already differentiated into definitive types. The present report is the first to provide unequivocal evidence of the existence of mitotic cells within these organs.…”

Section: Discussionmentioning

confidence: 93%

Dividing type II cell in rabbit taste bud

Toyoshima¹,

Tandler²

1986

Anat. Rec.

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“…Growing evidence suggests that a given taste nerve fiber 1) is associated with receptors of similar and perhaps identical chemical specificity (Oakley, 1972) and 2) synapses with taste cells sharing similar ultrastructural characteristics . Taste bud cells in the process of mitosis have also been observed in adult mammals (Granger and Beidler, 1990;Kinnamon, 1988, 1991;Shimamura et al, 1967;Toyoshima and Tandler, 1986).…”

Section: Taste Cell Turnover Introductionmentioning

confidence: 91%

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

Ganchrow

Royer

et al. 1993

Microscopy Res & Technique

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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.

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Three Dimensional Observations on the Taste Buds in Rabbits

Cited by 7 publications

References 12 publications

Application of serial sectioning and three‐dimensional reconstruction to the study of taste bud ultrastructure and organization

Application of serial sectioning and three‐dimensional reconstruction to the study of taste bud ultrastructure and organization

Dividing type II cell in rabbit taste bud

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

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