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Results for “Palatal Muscles”

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At least 19 recordsLinked to original sources
PubMed1994

Respiratory-related activity of soft palate muscles: augmentation by negative upper airway pressure.

We studied respiratory-related activity of the soft palate muscles in 10 anesthetized tracheostomized supine dogs. Moving time average (MTA) electromyographic (EMG) activity was measured in the palatinus (PAL), levator veli palatini (LP), and tensor veli palatini (TP) with bipolar fine-wire electrodes and in the diaphragm with bipolar hook electrodes. Measurements were made during tracheostomy breathing and nasal breathing with the mouth sealed (NB). During tracheostomy breathing, all soft palate muscles displayed respiratory-related phasic inspiratory and expiratory as well as tonic EMG activity. During NB, peak inspiratory EMG activity increased in PAL, LP, and TP because of an increase in both phasic inspiratory and tonic MTA activity. In contrast, phasic expiratory activity did not change. A constant negative pressure equal to peak inspiratory tracheal pressure during NB was applied to the caudal end of the isolated upper airway with the nose occluded. This was associated with soft palate muscle responses qualitatively similar to the responses during NB but accounted for only 39, 25, and 32% of the magnitude of the peak inspiratory MTA EMG responses to NB in PAL, LP, and TP, respectively. Our results demonstrate that the soft palate muscles exhibit respiratory-related activity in common with other upper airway muscles. Furthermore, such activity is augmented in each soft palate muscle during NB, and negative upper airway pressure makes a substantial contribution to the recruitment of soft palate muscle activity.

Anesthesia↗
PubMed1994

Soft palate muscle activity in response to hypoxic hypercapnia.

We studied the effects of increasing respiratory drive on electromyographic (EMG) soft palate muscle (SPM) activity in nine anesthetized tracheostomy-breathing dogs during hypoxic hypercapnia (HH) with a 14% O2-8% CO2-78% N2 inspired gas mixture. Moving time average EMG activity was recorded from palatinus (PAL), levator veli palatini (LP), and tensor veli palatini (TP) muscles (with bipolar fine-wire electrodes) and diaphragm (DIA; with bipolar hook electrodes). During HH, peak inspiratory DIA activity increased from 18.8 +/- 1.3 to 30.1 +/- 2.0 arbitrary units and minute ventilation increased from 6.2 +/- 0.3 to 18.3 +/- 1.8 l/min (both P < 0.001). Phasic inspiratory, expiratory, and/or tonic EMG activity was present in each SPM during room air breathing (control) and increased during HH (P < 0.05), except for phasic inspiratory PAL and phasic expiratory TP activities. Peak inspiratory LP and TP activities increased during HH to 250 and 179% of control, respectively, and peak expiratory activity increased to 187, 235, and 181% of control in PAL, LP, and TP, respectively. These findings demonstrate respiratory-related regulation of SPM activity independent of local reflex control from the upper airway. However, the combined inspiratory and expiratory phasic recruitment of these muscles differs from the inspiratory recruitment of known upper airway dilator muscles.

Animals↗
PubMedDate not supplied

[The age-related functional characteristics of the facial and soft palatal muscles in healthy children based on rheo- and electromyographic data].

Rheo- and electromyographies were used to examine facial and soft palate muscle functions in 120 children aged 4 to 12 years. The findings evidence that the blood flow intensity and velocity reduce with age, as does the response to the functional test; the vascular tone increases. The bioelectric activity of the above-mentioned muscles grows with age, this evidencing the development of a child's neuromuscular and vascular systems.

Aging↗
PubMed1977

Development and peripheral innervation of the palatal muscles.

Following the observation of 51 embryos and human fetuses of between 9 and 190 mm vertex/coccys length, cut transversally, frontally, or sagittally, depending on the case, and coloured with HE, Azan, or by the Bielschowsky method, we studied the development, and peripheral innervation of the palatal muscles. We reached a series of conclusions which we put forward in this paper. The m. tensor veli palatini is the one which develops earliest. It derives from the sam blastematic mass as the muscles of mastication, and it is innervated by a branch of the n. mandibularis. The m. levator veli palatini and m. pharyngopalatinus coincide chronologically with the appearance of the m. cephalopharyngeus. They derive from the pharyngeal musculature, and are innervated by fibres proceeding from the n. glossopharyngeus, in the case of the first one, and, in the case of the second, by direct branches from the n. glossopharyngeus and n. vagus, which penetrate the muscle directly, without prior contact with any nerve plexus. The m. uvulae is first formed, at the time the palatine processes close. In the first place, two outlines may be seen; but after 50 mm approximately it is formed by one muscle only, on the medial line; it is innervated by branches which proceed from the posterior n. palatinus. The m. glossopalatinus is the last to appear. It is closely linked to the musculature of the tongue and, therefore, we think that it derives from the hypobranchial musculature, and that is innervated in the body of the tongue itself, by means of the n. hypoglossus.

Humans↗
PubMed1994

Histochemical analysis of cleft palate muscle.

Research has clarified the abnormal insertions and orientations of the involved musculature in cleft palate. However, little is known about the physiologic aspects of these muscles, specifically from a histochemical perspective. In this study, 30 muscle specimens were removed from the palatal cleft margin in patients undergoing primary palatoplasty. Nine patients had combined cleft lip and palate deformity, and seven had an isolated cleft palate. Biopsies were taken from the area of the musculus uvulus in all specimens and examined by histochemical techniques. The percentage of type 1 and type 2 fibers was different in isolated cleft palate as compared with cleft lip and palate specimens, being, respectively, 56.7 percent type 1 and 43.3 percent type 2 and 62.0 percent type 1 and 38.0 percent type 2 fibers. This is the opposite ratio from other facial muscles but is in line with the literature regarding normal palatal muscle. Isolated cleft palate muscle fibers also were minimally decreased in diameter as compared with normal facial muscle. Fiber diameters of the combined cleft lip and palate muscles were severely decreased in size compared with those muscles found in the cleft lip. Abnormal mitochondrial accumulations also were found in cleft lip and palate muscle specimens but not in isolated cleft palate muscle specimens. We consider the decrease in muscle diameter found in isolated cleft palate to be secondary to functional atrophy, while that in the cleft lip and palate specimens is secondary to a primary hypoplasia together with a functional atrophy.(ABSTRACT TRUNCATED AT 250 WORDS)

Biopsy↗
PubMed1984

Neuroanatomical considerations of palatal muscles: tensor and levator veli palatini.

The tensor veli palatini (TVP) and levator veli palatini (LVP) muscles are intimately associated with the soft palate and knowledge of their anatomy and physiology is essential for palatoplasty. Controversy regarding the function and innervation of these muscles still exists. The purpose of this study was to identify the location of motoneurons within the brainstem which innervate the TVP and LVP using the current neuroanatomical tracing technique of retrograde axonal transport of horseradish peroxidase (HRP). HRP was injected into each of these muscles in adult cats. Following a twenty-four hour survival the animals were sacrificed, the brain removed and processed using tetramethyl benzidene . TVP motoneurons were located in the rostral two-thirds of the ventromedial division of the trigeminal motor nucleus. LVP motoneurons were located in the rostral 2 mm of the nucleus ambiguus ipsilaterally and to a lesser extent contralaterally as well as in the retrofacial nucleus ipsilaterally. Our study has addressed neuroanatomical aspects essential to an understanding of the structure and function of the palatal muscles. Unraveling the central connections of the TVP, LVP motoneurons may clarify understanding of such complex functions as swallowing, sucking, blowing and speech.

Animals↗
PubMed1995

Effect of posture, route of respiration, and negative pressure on palatal muscle activity in humans.

Sleep apnea is worse in the supine posture and is associated with retropalatal airway narrowing or occlusion. We have, therefore, examined the effects of posture, negative pressure, and route of respiration on palatal muscle activity in 13 nonsnoring awake male subjects by using electromyography. Electromyographic activity of the levator palatini and palatoglossus was expressed as a percentage of maximum activity. Both the levator palatini (P = 0.002) and palatoglossus (P = 0.002) exhibited phasic inspiratory activity. Overall, posture did not affect the levator palatini (F = 1.58; P = 0.23) or palatoglossus (F = 0.98; P = 0.34) activity, but analysis by route of respiration showed the palatoglossus to be more active when the subjects were nose breathing supine (F = 6.64; P = 0.02). Levator palatini activity was lower when nose breathing was compared with mouth breathing in both the erect and supine postures (F = 6.67; P < 0.02). Nose breathing with the mouth held open caused an increase in palatoglossal activity (P = 0.04). Negative-pressure application (0 to -12.5 cmH2O) caused significant increases in levator palatini (P < 0.001) and palatoglossus (P < 0.001) activity, 100 ms after pressure stimulus, irrespective of route. However, the palatoglossus required significantly greater negative pressures to cause activation when applied via the nose compared with the mouth (P < 0.05). These observations indicate that the levator palatini and palatglossus have respiratory activity and are reflexly activated by negative pressure.

Adult↗
PubMed1992

Respiratory activities in relation to palatal muscle contraction.

This study investigated the activities of the tensor and levator veli palatini muscles related to respiration. During quiet breathing, no activity was observed in either muscle. With either hypercapnic or hypoxemic condition, the tensor veli palatini muscle exhibited phasic activity during inspiration. The levator veli palatini muscle showed phasic activity during expiration with hypoxemia (PaO2 less than 40 mm Hg). NaCN perfused bilaterally through the carotid sinus induced these respiratory activities. The tensor veli palatini muscle was more sensitive than the levator veli palatini muscle to NaCN.

Animals↗
PubMed1995

Palatal muscle electromyogram activity in obstructive sleep apnea.

Eight subjects (5 men, 3 women, ages 27 to 55) with obstructive sleep apnea syndrome (OSAS) were studied to quantify and compare electromyographic (EMG) activity of levator veli palatini (LVP) and palatoglossus (PG), two velopharyngeal muscles, and genioglossus (GG) during obstructive apnea cycles in non-rapid eye movement (NREM) sleep. EMG activity of three successive preapneic breaths, first and last apneic efforts, and three successive postapneic breaths was quantified for each muscle as peak phasic inspiratory EMG normalized as percent activity of the last preapneic breath. In all subjects, apnea onset coincided with simultaneous inspiratory EMG nadir of all three muscles (LVP = 63 +/- 40%, PG = 74 +/- 53%. GG = 83 +/- 48%. mean +/- SD activity of last preapneic breath). Apnea resolution did not occur until inspiratory EMG of all three muscles simultaneously reached maximal activity, at levels significantly greater than preapneic activity as well as activity of the last preapneic effort (LVP = 215 +/- 205%, PG = 227 +/- 240+, GG = 235 +/- 202%, mean +/- SD activity of last preapneic breath, p < 0.05, Fisher's partial least-squares difference [PLSD] test for each muscle). The presence or absence of electroencephalographic arousal at apnea resolution did not influence these patterns of EMG activity. Inspiratory recruitment of velopharyngeal as well as oropharyngeal muscles appears to be associated with upper airway patency during sleep in patients with OSAS.

Adult↗
PubMed1991

Effects of synthetic hormone implants, singularly or in combinations, on performance, carcass traits, and longissimus muscle palatability of Holstein steers.

Seventy-two Holstein steers averaging 182 kg were assigned randomly to one of six treatment groups: 1) nonimplanted controls (C); 2) implanted with 36 mg of zeranol (Z); 3) implanted with 20 mg of estradiol benzoate and 200 mg of progesterone (EP); 4) implanted with 140 mg of trenbolone acetate (TBA); 5) implanted with 140 mg of trenbolone acetate plus 20 mg of estradiol benzoate and 200 mg of progesterone (TBA + EP); and 6) implanted with 140 mg of trenbolone acetate plus 36 mg of zeranol (TBA + Z). Each treatment group consisted of three replications of four animals per pen, which were implanted on d 0, 56, 112, and 168. Masculinity and muscling scores were assigned at 24 h preslaughter. Hide removal difficulty was scored by a plant supervisor. Quality and yield grade data were obtained at 24 h postmortem. Longissimus muscle (LM) steaks were removed and cooked for Warner-Bratzler shear (WBS) determinations and sensory panel (SP) evaluations. Over the entire feeding period (249 d), TBA + EP steers had higher (P less than .05) ADG than TBA + Z, TBA, and C steers. All treatments had higher (P less than .05) ADG than C, with the exception of TBA. The only feed efficiency differences were those following the 168-d implant time, when TBA steers were more (P less than .05) efficient than TBA + Z or C steers. The TBA + EP and TBA + Z steers were more (P less than .05) masculine and their hides were more (P less than .05) difficult to remove than those of EP and C steers. Carcass weights of TBA + EP steers were heavier (P less than .05) than those of TBA or C steers. The TBA + EP steers had larger (P less than .05) LM areas than Z, TBA, and C steers. Also, TBA + EP steers tended (P = .07) to have lower numerical yield grades than EP, Z, or C steers. Even though mean marbling scores and quality grades were similar (P greater than .05) among treatment groups, only 50% of TBA + EP carcasses graded low Choice or higher, compared with 100, 75, 82, 90, and 83% for C, TBA, Z, EP, and TBA + Z carcasses, respectively. The only meat palatability differences were that myofibrillar and overall tenderness scores tended to be lower (P = .07) for steaks from EP and TBA + Z than for steaks from Z and C groups.

Anabolic Agents↗
PubMed1984

Audiological investigation of palatal myoclonus.

Palatal myoclonus, the rapid rhythmic contraction of palatal muscles, is a rare neurological disorder with many etiologies. Although most disease processes associated with this disorder affect the cerebellum, the auditory symptoms are often the first clue to diagnosis. Existing literature was reviewed in terms of auditory symptoms, pathophysiology, audiologic diagnostic procedures and rehabilitative strategies. In addition, a case study of a 34-yr-old woman who has had this highly peculiar degenerative disorder for over 20 yrs was described. Implications for appropriate rehabilitation strategies were addressed and the importance of comprehensive management was stressed.

Adult↗
PubMed1984

Unilateral palatal paralysis caused by lesion in the corticobulbar tract.

A patient with a cerebral infarct affecting the anterior limit of the superior segment of the corona radiata had unilateral paralysis of the palatal muscles without notable weakness of the extremities. The site of the lesion corresponded to the location of the corticofugal motor tract from the motor cortex to the genu of the internal capsule.

Aged↗