dilator muscle


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Related to dilator muscle: ciliary muscle

di·la·tor mus·cle

[TA]
a muscle that opens an orifice or dilates the lumen of an organ; it is the dilating or opening component of a pylorus (the other component is the sphincter muscle).
Synonym(s): musculus dilatator [TA]

di·la·tor mus·cle

(dī'lā-tŏr mŭs'ĕl) [TA]
A muscle that opens an orifice or dilates the lumen of an organ; it is the dilating or opening component of a pylorus (the other component is the sphincter muscle).
References in periodicals archive ?
Thompson and Mensher (1) found that phenylephrine was more useful than adrenaline when testing supersensitivity of the iris dilator muscle, but they mostly used a 10% solution that causes extensive mydriasis even in a normal pupil.
Patients with OSA have increased pharyngeal dilator muscle activity (as a percentage of maximum) versus matched controls (59) that has been interpreted as evidence for neuromuscular protective compensatory reflexes in response to anatomical compromise in OSA.
Multiple factors can influence output from the hypoglossal motor nucleus to the major upper airway dilator muscle (the genioglossus) (70-76).
He concluded from these results that 1) upper airway patency is possible even in the absence of dilator muscle activity meaning that these muscles are not the only factor in upper airway collapse and 2) thoracic forces which pull on the trachea play a role in upper airway patency.
Normally, the diameter of the upper airway increases during inhalation and decreases during exhalation, The changes in upper airway diameter during respiration is thought to primarily result from increased activation (during inhalation) and decreased activation (during exhalation) of pharyngeal dilator muscles such as the geniohyoid, sternohyoid, genioglossus, and stylopharyngeus muscles.
This activation increases the tone of the upper airway dilator muscles.