dilator

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dilator

[dī′lād·ər]
(physiology)
Any muscle, instrument, or drug causing dilation of an organ or part.
References in periodicals archive ?
The pathophysiology of IFIS is not well understood, and current research is mostly focused on the direct effect of [alpha]1-adrenergic antagonists on the iris dilator muscle.
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.
9) In OSP, sympathetic denervation results in upregulation of a-receptors which, in turn, unmasks the weak effect of apraclonidine on a1-receptors in the pupil dilator muscle by causing mydriasis.
Imaging studies during wakefulness, however, are complicated to interpret since ongoing pharyngeal dilator muscle activity (greater in OSA than controls (59)) may lead to observed differences between groups based on non anatomical (i.
1) The lack of response of the iris dilator muscle may be attributable to the fact that it is largely [[alpha].
The balance of 'tone' in the autonomic nervous system arising from the sphincter muscle, which is under parasympathetic innervation (resulting in miosis), and the dilator muscle, which is under sympathetic innervation (resulting in mydriasis)
Their larynx has a rigid fibrous structure and a dilator muscle in addition to a constrictor muscle.
The dilator muscle moves away from the pupil like bicycle spokes.
the dogs had no dilator muscle activity), During the apneic episode, he stimulated the dogs' phrenic nerve to trigger diaphragmatic contractions; each contraction caused the dog to inhale.