Activities of Superior Pharyngeal Constrictor and Levator Veli Palatini Muscles Related to Respiration in Dogs

Abstract

Objective:

This study, using mongrel dogs, attempted to delineate the respiratory activity of two closure muscles of the velopharynx, the levator veli palatini (LVP) and superior pharyngeal constrictor (PC) muscles.

Method:

Fifteen mongrel dogs were given tracheotomies, with intratracheal tubes being connected to their respiratory circuits. Activities of the PC and LVP muscles were recorded electromyographically, and the effects of Pao₂ and Paco₂ were analyzed along with the effects of lung inflation intratracheally with O₂ and N₂.

Results:

Under hypoxic conditions, expiratory LVP activity was observed while PC activity diminished. The effects of lung inflation on both LVP and PC activities were also studied. The activities of both muscles were enhanced by lung inflation.

Conclusion:

It was thus suggested that the roles of both muscles during velopha-ryngeal closing movements are not the same.

Keywords

levator veil palatini muscle palate pharyngeal constrictor velopharyngeal closure

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References

Armstrong

D.J.

Luck

J.C.

A comparative study of irritant and type J receptors in the cat.

Respir Physiol 1974; 21: 47–60.

Bell-Berti

An electromyographic study of velopharyngeal function in speech.

J Speech Hear Res 1976; 19: 225–240.

Bosma

J.F.

Fletcher

S.O.

The upper pharynx: physiology.

Ann Otol Rhinol Laryngol 1962; 71: 134–157.

Cozine

R.A.

Ngai

S.H.

Medullary surface chemoreceptors and regulation of respiration in the cat.

J Appl Physiol 1967; 22: 117–121.

Dappenheimer

J.R.

Fencl

Heisei

S.R.

Held

Role of cerebral fluids in control of respiration as studied in anesthetized goats.

Am J Physiol 1965; 208: 436–450.

Fritzell

The velopharyngeal muscles in speech.

Acta Otolaryngol Suppl (Scand) 1979; 250: 1–81.

Fuller

R.W.

The human pharmacology of Capsaicin.

Arch Int Pharmacodyn Ther 1990; 303: 147–156.

Gray

B.A.

Response of the perfused carotid body to changes in pH and Pco₂.

Respir Physiol 1968; 4: 229–245.

Hornbein

T.F.

Griffo

Z.J.

Ross

Quantitation of chemoreceptor activity: interaction of hypoxia and hypercapnia.

J Neurophysiol 1961; 24: 561–581.

10.

Hornbein

T.F.

Ross

Specificity of H ion concentration as a carotid chemoreceptor stimulus.

J Appl Physiol 1963; 18: 580–584.

11.

Kogo

Hamaguchi

Matsuya

Observation of velopharyngeal closure patterns following isolated stimulation of levator veli palatini and pharyngeal constrictor muscles.

Cleft Palate Craniofac J 1996; 33: 273–276.

12.

Kogo

Kurimoto

Koizumi

. Respiratory activities in relation to palatal muscle contraction. Cleft Palate Craniofac J 1992; 29: 174–178.

13.

Kogo

Nishio

Matsuya

. Coordination of the levator veli palatini and intrinsic laryngeal muscles: an evoked electromyographic study in the dog. Cleft Palate J 1987; 24: 119–125.

14.

Koizumi

Kogo

Matsuya

Effect of lung inflation on levator veli palatini muscle activity.

J Dent Res 1995; 74: 1235–1239.

15.

Koizumi

Kogo

Matsuya

Coordination between palatal and laryngeal muscle activities in response to rebreathing and lung inflation.

Cleft Palate Craniofac J 1996; 33: 459–462.

16.

Koller

E.A.

, Atmung und Kreislauf im anaphylaktishen Asthma bronchiale des Meerschweinchen. Ill, Die Lungenveranderungen im Athmaanfall und die inspiratorische Reaktion. Helv Physiol Pharmacol Acta 1968; 26: 153–170.

17.

Kuehn

D.P.

Relationships between muscle activity and velar position.

Cleft Palate J 1982; 19: 25–35.

18.

Lambertsen

C.J.

Semple

S.J.G.

Smyth

M.G.

Gelfand

H⁺ and PCO₂ as chemical factors in respiratory and cerebral circulatory control.

J Appl Physiol 1961; 16: 473–484.

19.

Lambertsen

C.J.

Semple

S.J.G.

Smyth

M.G.

Gelfand

H⁺ and Pco₂, as chemical drive on respiratory muscle EMG and respiratory timing.

J Appl Physiol 1977; 42: 287–294.

20.

McWilliams

B.J.

Morris

Shelton

R.L.

Cleft palate speech. Burlinglon, ON: BC Decker, 1984.

21.

Mitchell

R.A.

Loesciicke

H.H.

Massion

W.H.

Severinghaus JW. Respiratory responses mediated through superficial chemosensilive areas on the medulla.

J Appl Physiol 1963; 18: 523–533.

22.

Natsui

Respiratory response to arterial H⁺ al different levels of arterial Pco, during hyperoxia or hypoxia.

Pflugers Arch 1970; 316: 34–50.

23.

Paintal

A.S.

Vagal sensory receptors and their reflex effects.

Physiol Rev 1973; 53: 159–227.

24.

Schlafke

Loeschke

H.H.

Lokalisation eines an der Regulation von Atmung und Kreislauf beteigten Gebietes an der ventralen Oberflache der medulla oblongata durch Kalteblockade.

Pflugers Arch 1967; 297: 201–220.

25.

Schlafke

See

W.R.

Massion

W.H.

Loeschcke

HH.

Die Rolle “spezifischer” und unspezifischer Afferenzen fur den Antrieb der Atmung, untersucht durch Reizung und Blockade von Afferenzen an der decerebrierten Katze.

Pflugers Arch 1969; 312: 189–205.

26.

Widdicombe

J.G.

Receptors in the trachea and bronchi of the cat.

J Physiol 1954; 123: 71–104.