What does iris dilator muscle mean?
Definitions for iris dilator muscle
iris dila·tor mus·cle
This dictionary definitions page includes all the possible meanings, example usage and translations of the word iris dilator muscle.
Wiktionary
iris dilator musclenoun
A muscle of the eye, serving to dilate the iris.
Wikidata
Iris dilator muscle
The iris dilator muscle, is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator. The pupillary dilator consists of a spokelike arrangement of modified contractile cells called myoepithelial cells. These cells are stimulated by the sympathetic nervous system. When stimulated by the sympathetic nervous system, the cells contract, widening the pupil and allowing for more light to pass through the eye. Pupillary dilation occurs in two situations: when light intensity changes and when we shift our gaze between distant and nearby objects. The pupillary dilator acts as an antagonist to the pupillary constrictor which narrows the pupil and admits less light to the eye. It has its origin from the anterior epithelium. It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on α1-receptors. Thus, when presented with a threatening stimuli that activates the fight-or-flight response, this innervation contracts the muscle and dilates the iris, thus temporarily letting more light reach the retina. The pupillary dilator acts as an antagonist to the pupillary constrictor which narrows the pupil and admits less light to the eye.
Numerology
Chaldean Numerology
The numerical value of iris dilator muscle in Chaldean Numerology is: 8
Pythagorean Numerology
The numerical value of iris dilator muscle in Pythagorean Numerology is: 9
Translations for iris dilator muscle
From our Multilingual Translation Dictionary
- ஐரிஸ் விரசித் சிவப்புTamil
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"iris dilator muscle." Definitions.net. STANDS4 LLC, 2024. Web. 25 Apr. 2024. <https://www.definitions.net/definition/iris+dilator+muscle>.
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