Local gustatory functions associated with segmental organization of the anterior portion of cat's tongue☆

Ishiko, Nobusada

doi:10.1016/0014-4886(74)90123-x

Cited by 10 publications

(12 citation statements)

References 11 publications

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“…Modified from Miller and Preslar (1975). tongue-region gustatory stimulation. Similar evidence of functional overlap has been obtained in macaque monkeys (Macaca irus) by Ishiko (1974) and in the domestic catby Oakley (1972Oakley ( , 1975 and Ishiko (1974). The apparent anatomical absence of fungiform papillae in the vallate region of the rat is confirmed by Frank's (1968) observation of a lack of rat chorda tympani nerve responses to posterior tongue-region stimulation.…”

Section: Receptorssupporting

confidence: 60%

“…The gustatory afferent axons of the chorda tympani nerve thus are part of the facial nerve but reach the tongue and its papillae in branches of the lingual nerve. This arrangement has been described by Pfaffmann (1959) and studied electrophysiologically by Ishiko (1974). Occasionally, a suggestion of trigeminal-nerve (Cranial V) innervation of fungiform-papillae taste buds is made.…”

Section: Receptorsmentioning

confidence: 91%

“…Instead, the chorda tympani nerve innervation reaches the tongue in branches of the distal portion of the lingual nerve. These trigeminal branches have been reported in detail by Ishiko (1974) for some species. Thus, three relevant lingual-nerve branches are described in the domestic cat, F. domesticus (anterior, medial, and posterior branches), while in the "crab-eating" macaque monkey, M. irus, five branches are recognized.…”

Section: Receptorsmentioning

confidence: 92%

“…These papillae also occur in the vallate region (i.e., the region of the circumvallate papillae) of some primates (Sonntag, 1921;Ishiko, 1974) and ungulates (Sonntag, 1922). For one ungulate, the cow (Bos taurus), chorda tympani nerve responses were recorded by Bernard (1962Bernard ( , 1964 upon posterior Figure 3.…”

Section: Receptorsmentioning

confidence: 99%

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Functional Anatomy of the Tongue and Mouth of Mammals

Halpern

1977

Drinking Behavior

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Section: Receptorssupporting

confidence: 60%

Section: Receptorsmentioning

confidence: 91%

Section: Receptorsmentioning

confidence: 92%

Section: Receptorsmentioning

confidence: 99%

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Functional Anatomy of the Tongue and Mouth of Mammals

Halpern

1977

Drinking Behavior

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“…Although there are fewer fungiform papillae posteriorly than at the tip of the tongue, each papilla is larger and has a greater number of taste buds on its surface (P. P. Robinson, unpublished observations). Ishiko (1974) investigated regional differences in sensitivity of the cat's tongue by recording from the three terminal branches of the lingual nerve, supplying anterior, middle and posterior segments of the tongue. He recorded the smallest responses from the branch supplying the anterior part, consistent with the present study, but also found that the middle section of the tongue was most sensitive to NaCl and the posterior section to HCl.…”

Section: Discussionmentioning

confidence: 99%

The characteristics and regional distribution of afferent fibres in the chorda tympani of the cat.

Robinson

1988

The Journal of Physiology

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SUMMARY1. Experiments were carried out on the cat's tongue to investigate regional variations in sensitivity to gustatory and thermal stimuli and to determine whether taste buds responding to particular stimuli are unique to specific areas.2. In ten cats, integrated whole-nerve activity was recorded from the left chorda tympani during stimulation of the anterior, middle or posterior segments of the tongue. The level of activity produced by gustatory or thermal stimuli increased towards the posterior segment of the tongue but the relative activity evoked by each stimullus was similar for each segment. 3. Recordings were made from 108 single units dissected from the chorda tympani; fifty-five responded principally to gustatory stimuli, twenty were principally thermosensitive and thirty-three were purely mechanosensitive.4. The gustatory units could be subdivided according to the stimuli which evoked the most vigorous discharge; there were sixteen salt units, eighteen acid units, nineteen salt-acid units and two quinine units. The salt units had a higher level of spontaneous activity than the other groups and the acid units supplied more fungiformn papillae with a greater separation between them.5. The two quinine units were both located near to the mid-line posteriorly but all other groups of gustatory, thermosensitive and mechanosensitive units were distributed over all regions of the dorsal surface of the tongue and did not have higher discharge rates in specific areas.6. tIfdividual stimulation of the fungiform papillae supplied by a single unit revealed that similar responses were evoked from each papilla but stimulation of a single papilla supplied by two or more units could evoke a different response in each unit.7. This study revealed that the relative sensitivity to gustatory and thermal stimuli was similar in each region of the tongue and that taste buds responding to particular stimuli are not confined to specific areas.

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Regeneration of fungiform taste buds: Temporal and spatial characteristics

Cheal

Oakley

1977

J of Comparative Neurology

123

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The gross morphology of the tongue of the Mongolian gerbil Meriones unguiculutus), the location of papillae and taste buds, and the normal innervation pattern of the tongue and taste buds were determined. The chorda tympani nerve was interrupted to produce degeneration of fungiform taste buds. Regenerating chorda tympani axons followed the original nerve pathways in the tongue en route to the fungiform papillae in the epithelium where they initiated the regeneration of taste buds. The spatial distribution of reinnervated fungiform papillae and reformed taste buds was examined 7 to 19 days following surgery.Beginning at eight days following chorda tympani interruption there was a progressive increase, first, in the proportion of fungiform papillae that were reinnervated, and later in the number of reformed taste buds. On the basis of these measures it was concluded that a taste bud is reformed one to two days after reinnervation of its papilla. From the time course of reinnervation of the fungiform papillae it was calculated that some fibers regenerated at rates in excess of 2 mm/day. Regeneration was precise and systematic. The regenerating chorda tympani fibers accurately returned to the fungiform papillae; they did not follow the pathways of lingual nerve axons. In the initial stages of recovery both reinnervated papillae and reformed taste buds were preferentially located toward the front of the tongue; the reinnervation of posterior fungiform papillae was delayed.

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Local gustatory functions associated with segmental organization of the anterior portion of cat's tongue☆

Cited by 10 publications

References 11 publications

Functional Anatomy of the Tongue and Mouth of Mammals

Functional Anatomy of the Tongue and Mouth of Mammals

The characteristics and regional distribution of afferent fibres in the chorda tympani of the cat.

Regeneration of fungiform taste buds: Temporal and spatial characteristics

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