Tongue mechanoreceptors: comparison of afferent fibers in the lingual nerve and chorda tympani

Biedenbach, M.A.; Chan, Kwan Y.

doi:10.1016/0006-8993(71)90507-5

Cited by 53 publications

(43 citation statements)

References 8 publications

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“…The ratios of SA to FA and of SA II to SA I are larger in the present data than in a study by Trulsson and Essick (1997;SA/FA, 27/23 vs. 8/14; SA II/SA I, 11/16 vs. 2/6). The ratio of SA to FA afferents is also higher in our data than in a study by Biedenbach and Chan (1971), although they did not classify SA afferents into SA I and SA II types. These differences may due to differences in the methods of stimulus, e.g., whether or not stretch stimulus is applied to the Fig.…”

Section: Mechanoreceptors In the Dorsal Mucosa Of The Tonguecontrasting

confidence: 76%

“…Similar to the present study, most afferents have been reported to supply the dorsal surface of the tongue in which afferents exhibiting small receptive field innervate the tip of the tongue. Porter (1966) found that all of the afferents are the FA type, whereas Biedenbach and Chan (1971) found 74% of 28 units to be the FA type. Recently, as was mentioned above, Trulsson and Essick (1997) identified 22 lowthreshold mechanoreceptive afferents in the human lingual nerve and classified these units into three types: FA I (n ϭ 14), SA I (n ϭ 6), and SA II (n ϭ 2), similar to the present study.…”

Section: Mechanoreceptors In the Dorsal Mucosa Of The Tonguementioning

confidence: 95%

“…In prior physiological studies (Porter, 1966;Biedenbach and Chan, 1971), FA or FA and SA afferents have been identified from the cat lingual nerve. Similar to the present study, most afferents have been reported to supply the dorsal surface of the tongue in which afferents exhibiting small receptive field innervate the tip of the tongue.…”

Section: Mechanoreceptors In the Dorsal Mucosa Of The Tonguementioning

confidence: 99%

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Morphological differences between fast and slowly adapting lingual afferent terminations in the principal and oral nuclei in the cat

et al. 1998

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Previous studies indicated that fast-adapting (FA) and slowly adapting (SA) mechanoreceptive afferents innervating the facial or intraoral structures give rise to morphologically distinct terminal arbors in the individual subdivisions of the trigeminal sensory nuclear complex. The present study examined the collateral morphologies of lingual afferents in the nuclei principalis (Vp) and oralis (Vo) of the cat. Seven FA and six SA lingual afferents were physiologically characterized and stained by the intra-axonal horseradish peroxidase (HRP) injection technique. The two types of afferents established terminal arbors in the dorsomedial subdivision (Vpd) of the Vp, and the rostrodorsomedial (Vo.r) and dorsomedial subdivisions (Vo.dm) of the Vo, but the collateral morphologies are different between the two types. The FA afferents gave rise to mediolaterally extended oblong arbors in each subdivision, but the arbors were better developed in the Vo.r than in the Vpd and Vo.dm. The number of collaterals, intercollateral distance, number of boutons per collateral, and bouton size were also different among the subdivisions. The SA afferents were divided into two subtypes; one had a preferential projection into the Vpd or the Vo.r and Vo.dm, and others lacked a selected projection. Although the shape of their arbors varied from a stringy form to a roundish form, the general profile was denser, better developed, and rounder than that of FA afferents in each subdivision. The intercollateral distance and bouton size were different among the subdivisions. The number of boutons per collateral, bouton density, and bouton size were larger in SA than FA afferents in each subdivision. The present study demonstrated that two functionally distinct lingual afferents manifest unique morphological differences in the Vpd and Vo.

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Section: Mechanoreceptors In the Dorsal Mucosa Of The Tonguecontrasting

confidence: 76%

Section: Mechanoreceptors In the Dorsal Mucosa Of The Tonguementioning

confidence: 95%

Section: Mechanoreceptors In the Dorsal Mucosa Of The Tonguementioning

confidence: 99%

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Morphological differences between fast and slowly adapting lingual afferent terminations in the principal and oral nuclei in the cat

et al. 1998

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“…Les fibres du NL sont chémosensibles, thermosensibles, mécanosensibles, proprioceptives et nociceptives [28]. Parmi les fibres chémosensibles, un petit groupe est activé par l'application linguale de composés chimiques tels que le menthol [3].…”

Section: Discussionunclassified

Modulation des afférences gustatives linguales par les afférences du nerf alvéolaire inférieure : étude électro-gustomètrique chez l’homme

Lecor

Sall

Dieng-Sarr

et al. 2015

Med Buccale Chir Buccale

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Résumé -Introduction : La modalité orale gustative est assurée par une branche du nerf facial, la corde du tympan et par les nerfs glossopharyngien et vague. Le nerf trijumeau participe également à l'analyse sensorielle des aliments. L'objectif de cette étude était de tester la validité de la modulation de la perception gustative par les affé-rences sensitives du nerf alvéolaire inférieur (NAI) chez l'homme. Matériel et méthodes : Un groupe A (n = 100) soumis à l'anesthésie régionale du nerf alvéolaire inférieur (NAI) et un groupe contrôle (n = 100) soumis à l'anesthésie du nerf maxillaire avaient été sélectionnés. L'étude était réalisée en simple aveugle. Les mesures des seuils de détection électro-gustométriques (EMG) étaient réalisées avant et après l'anesthésie sans que l'expérimentateur ne sache si le sujet a reçu une anesthésie, ni quel type d'anesthésie était administré. Les seuils étaient testés en 9 points de la langue : d'abord au niveau de la pointe de la langue, puis au niveau du dos, ensuite au niveau des bords latéraux postérieurs et enfin au niveau de la partie la plus postérieure du dos de la langue. La corrélation entre le type d'anesthésie et les seuils EMG était effectuée avec le test rho de Spearman et les comparaisons intraet intergroupe étaient effectuées à l'aide du test de Mann et Whitney et du test de Wilcoxon. Le niveau de significativité est fixé à p ≤ 0,05. Résultats : Le groupe A montrait une augmentation des valeurs moyennes des seuils EGM après anesthésie régionale des afférences du NAI au niveau de tous les sites linguaux. Les seuils (en µA) les plus élevés étaient retrouvés sur le dos (stade 0 : Dr = 31,3 ± 10,3 ; Dl = 31,5 ± 10,2 contre stade 1 : Dr = 71,5 ± 46,9 ; Dl = 56,4 ± 33) et la partie postérieure de la langue (stade 0 : Pr = 20,8 ± 6,2 ; Pl = 20,8 ± 6,2 contre stade 1 : Pr = 38,7 ± 26,5 ; Pl = 32,1 ± 15,9). Dans ce groupe, la différence de seuils avant et après anesthésie régionale du NAI était statistiquement significative (p ≤ 0,005) pour tous les sites mesurés. Le groupe contrôle n´avait pas montré d'augmentation significative pour les valeurs moyennes des seuils après anesthésie des afférences du nerf maxillaire au niveau des 9 sites (p : NS). Dans la tranche d'âge 18-29 ans, indépendamment de l'âge, tous les sites avaient subi une augmentation significative des seuils EMG (p ≤ 0,05) après anesthésie régio-nale du NAI contrairement au groupe soumis à l'anesthésie du nerf maxillaire où aucune augmentation des seuils n'était constatée. Il existait une corrélation significative entre les seuils EMG et l'anesthésie régionale des affé-rences du NAI sur les 9 points de stimulations linguales (p < 0,001). Conclusion : Ces résultats montrent que l'anesthésie régionale des afférences dentaires du NAI entraînerait une modification des seuils de détection électro-gustatifs.

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“…The chorda tympani contains gustatory afferent fibres from fungiform papillae on the dorsal surface of the tongue, mechanosensitive fibres (Biedenbach & Chan, 1971), preganglionic parasympathetic secretomotor fibres to the submandibular and sublingual salivary glands and efferent vasodilator fibres to the tongue (Erici & Uvnas, 1952). Previous studies on the gustatory fibres in the cat (Pfaffman, 1941(Pfaffman, , 1955Cohen, Hagiwara & Zotterman, 1955;Nagaki, Yamashita & Sato, 1964;Ishiko & Sato, 1973) have revealed a range of fibres with different response properties but the majority of them respond to more than one type of gustatory stimulus.…”

Section: Introductionmentioning

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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Tongue mechanoreceptors: comparison of afferent fibers in the lingual nerve and chorda tympani

Cited by 53 publications

References 8 publications

Morphological differences between fast and slowly adapting lingual afferent terminations in the principal and oral nuclei in the cat

Morphological differences between fast and slowly adapting lingual afferent terminations in the principal and oral nuclei in the cat

Modulation des afférences gustatives linguales par les afférences du nerf alvéolaire inférieure : étude électro-gustomètrique chez l’homme

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

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