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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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barathvaj barathvaj
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13 years ago
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When bright light is shone on the eye light sensitive cells in the retina, including rod and cone photoreceptors and melanopsin ganglion cells, will send signals to the oculomotor nerve, specifically the parasympathetic part coming from the Edinger-Westphal nucleus, which terminates on the circular iris sphincter muscle. When this muscle contracts, it reduces the size of the pupil. This is the pupillary light reflex, which is an important test of brainstem function. Furthermore, the pupil will dilate if a person sees an object of interest.

How splinchter pupilae and dilator pupilae is controlled by nerves?

Plz and one help me in understanding the clear mechanism behind it
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~Bv ram~I'm a student for all those who teaches

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#1
13 years ago
The parasympathetic innervation of the eyes causes the sphincter pupillae to contract, thereby causing allowing constriction of the pupil, and in turn decreasing the amount of light into eye.

On the other hand, the sympathetic inneration of eyeball causes the dialator pupillae to contract, dialating the pupil, and in turn, increasing light into the eye.
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barathvaj Author
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#2
13 years ago
Plz any one help me in understanding it:(
~Bv ram~I'm a student for all those who teaches
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