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In the experiment on the photopupillary reflex what happened to the pupil of the nonilluminated eye?
In the experiment on the photopupillary reflex, when light is shone into one eye causing pupillary constriction (direct response), the nonilluminated eye will also exhibit pupillary constriction (consensual response) due to neural connections between both eyes and the brain. This demonstrates the consensual response component of the pupillary light reflex.
When a light is shone into one eye what happens to the pupil of the other eye?
When light is shone into one eye, the pupillary light reflex causes both pupils to constrict simultaneously due to the connection between the two eyes. This is known as a consensual response and helps to regulate the amount of light entering both eyes.
What is papillary reflex?
You probably mean the pupillary reflex. It is the reflex responsible for your pupils constricting (becoming smaller) when exposed to light and dilating (becoming bigger) when you walk into a dark room.
The part of the eye which decreases in size when a bright light is shone into the eye?
The pupil of the eye decreases in size when a bright light is shone into the eye. This is a reflexive response that helps to regulate the amount of light entering the eye to protect the sensitive retina from damage.
What is the purpose of consensual light reflex?
The consensual light reflex is a normal eye response where shining a light into one eye causes both pupils to constrict. This reflex helps maintain proper visual sensitivity and protects the eye from bright light by regulating the amount of light entering the eye.
What is the consensual reflex of the pupil?
The consensual reflex of the pupil is the simultaneous constriction of the pupil in both eyes when light is shone into one eye. This reflex is controlled by the autonomic nervous system to regulate the amount of light entering the eye and protect the retina.
Is the response of your pupil a reflex or a voluntary action?
The constriction of pupils in response to bright light is called the pupillary light reflex. If the light is shining directly into one eye, then the pupil in that eye will constrict (a direct response), but so will the pupil in the non-illuminated eye (a consensual response).This reflex involves two cranial nerves: the optic nerve, which senses the light, and the oculomotor nerve, which constricts both pupils. It is considered involuntary since you don't think about it.
What cranial nerve controls the response of the illuminated eye?
If the light is shining directly into one eye, then the pupil in that eye will constrict (a direct response), but so will the pupil in the non-illuminated eye (a consensual response). This reflex involves two cranial nerves: the optic nerve, which senses the light, and the oculomotor nerve, which constricts both pupils.
Why would such a response be of significant value in pupillary reflex?
Clinical significance[edit]In addition to controlling the amount of light that enters the eye, the pupillary light reflex provides a useful diagnostic tool. It allows for testing the integrity of the sensory and motorfunctions of the eye.[1]Under normal conditions, the pupils of both eyes respond identically to a light stimulus, regardless of which eye is being stimulated. Light entering one eye produces a constriction of the pupil of that eye, the direct response, as well as a constriction of the pupil of the unstimulated eye, the consensual response. Comparing these two responses in both eyes is helpful in locating a lesion.[1][5]For example, a direct response in the right pupil without a consensual response in the left pupil suggests a problem with the motor connection to the left pupil (perhaps as a result of damage to the oculomotor nerve or Edinger-Westphal nucleus of the brainstem). Lack of response to light stimulation of the right eye if both eyes respond normally to stimulation of the left eye indicates damage to the sensory input from the right eye (perhaps to the right retina or optic nerve).[1]Emergency room physicians routinely assess the pupillary reflex because it is useful for gauging brain stem function. Normally, pupils react (i.e. constrict) equally. Lack of the pupillary reflex or an abnormal pupillary reflex can be caused by optic nerve damage, oculomotor nerve damage, brain stem death and depressant drugs, such as barbiturates.Normally, both pupils should constrict with light shone into either eye alone. On testing each reflex for each eye, several patterns are possible.[6]Optic nerve damage on one side: (Example in parens.: Left optic nerve lesion) The ipsilateral direct reflex is lost (Example: when the left eye is stimulated, neither pupil constricts, as no signals reach the brain from the left eye due to its damaged optic nerve)The ipsilateral consensual reflex is intact (because light shone into the right eye can signal to the brain, causing constriction of both pupils via the normal oculomotor nerves)The contralateral direct reflex is intact (because light shone into the right eye can signal to the brain, causing constriction of both pupils via the normal oculomotor nerves)The contralateral consensual reflex is lost (because light shone into the eye on the damaged side cannot signal to the brain; therefore, despite the right eye's motor pathway (oculomotor nerve) being intact, no signals from the left eye are able to stimulate it due to the damage to the sensory pathway (optic nerve) of the left eye)Oculomotor nerve damage on one side: (Example in parens: Left oculomotor lesion) The ipsilateral direct reflex is lost (Example: when the left eye is stimulated, only the right pupil constricts)The ipsilateral consensual reflex is lost (Example: when the right eye is stimulated, only the right pupil constricts)The contralateral direct reflex is intact (because light shone into both eyes can still signal to the brain, and the pupil on the undamaged side will still be able to constrict via its normal oculomotor nerve)The contralateral consensual reflex is intact (because light shone into the left eye can still signal to the brain via the normal optic nerve, causing attempted constriction of both pupils; the contralateral pupil constricts via its normal oculomotor nerve, but the ipsilateral pupil is unable to constrict due to its damaged oculomotor nerve)
What is the state of the pupil before light was shone into it?
Before light is shone into the pupil, it is in a state of dilation, allowing more light to enter the eye in dim lighting conditions.
Why does my horse's slight walleye turn red when a light is shone on it?
Both of your horse's eyes generally will turn red when light is shone on it despite the walleye. This is because they have a membrane at the back of their eye similar to our tapetum lucidum that light reflects off of.
Is the pupillary light reflex sympathetic?
While pupillary size in principle is controlled both by the sympathetic and the parasympathic nervous system, the typical closure of the pupil after illumination (i.e. the pupillary light reflex) is mediated by the parasympathetic innervation of the constrictor muscle of the pupil.
