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Sagot :
The boy's mother, a neurologist noticed sympathetic activation of the radial muscles of the iris dilated the child's pupil.
In humans, the dilator muscles of the iris contains fibers that extend radially through the iris of the eye and involuntarily contract as available light decreases, thus dilating the pupil.
Pupillary dilation is controlled primarily by the sympathetic nervous system and interruption of the innervation of the dilator muscle can cause an abnormally small pupil, a condition seen as part of Horner syndrome.
Pupillary dilator increases the size of the pupil to allow more light to enter the eyes. It works in opposition to the pupillary constrictor. The pupil dilation occurs when there is an insufficient light for the normal functioning of eyes or during heightened sympathetic activity, for example during fear .
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