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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.
No, the pupillary light reflex is mediated by the autonomic nervous system, specifically the parasympathetic nervous system. When light is detected by the retina, it triggers a reflex that causes the pupils to constrict, a response mediated by the parasympathetic nervous system.
The pupillary light reflex regulates the intensity of light entering the eye at any time.
The consensual response (equal reactions illicited on both sides of the body) observed prevents eye damage when exposed to intense light, specifically damage to the photoreceptor cells - cones and rods. This also enables more light to enter the eye so we are able to see in the dark.
indirect pupillary light reflex = consensual pupillary light reflex the other unstimulated eye constrict at the same time as the stimulated eye
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Pupillary light reflex somatic or autonomic?
The pupillary light reflex is an autonomic response controlled by the parasympathetic and sympathetic branches of the autonomic nervous system. When light is detected by the retina, signals are sent to the brainstem to constrict the pupil (parasympathetic activation) or dilate the pupil (sympathetic activation) depending on the intensity of the light.
Why does the pupillary reflex benefit you?
The pupillary reflex helps to regulate the amount of light entering the eye, allowing for optimal vision in changing light conditions. This reflex helps protect the retina from damage due to excessive light exposure and ensures that visual information is processed effectively by the brain.
What nerve acts as the afferent pathway in the pupillary reflex?
The optic nerve (cranial nerve II) carries sensory information about light intensity to the brain as part of the afferent pathway in the pupillary reflex.
Is the pupillary light reflex contralateral or ipsilateral?
The patellar reflex is ipsilateral. If the stimulus is applied to left knee cap, the left knee responds. On the other hand, if the right knee were to respond to a left knee stimulus, the response would be considered contralateral.
What part of the PNS controls the pupillary response?
The autonomic nervous system, specifically the parasympathetic and sympathetic branches, control the pupillary response. The parasympathetic system causes pupillary constriction (miosis), while the sympathetic system causes pupillary dilation (mydriasis).
Pupillary light reflex somatic or autonomic?
The pupillary light reflex is an autonomic response controlled by the parasympathetic and sympathetic branches of the autonomic nervous system. When light is detected by the retina, signals are sent to the brainstem to constrict the pupil (parasympathetic activation) or dilate the pupil (sympathetic activation) depending on the intensity of the light.
Is pupillary light reflex a monosynaptic or polysynaptic reflex?
The pupillary light reflex is a polysynaptic reflex. When light is sensed by the retina, a signal is sent via the optic nerve to the pretectal nuclei in the midbrain, which then sends signals to both the parasympathetic and sympathetic pathways controlling the muscles of the iris to constrict or dilate the pupil appropriately.
The pupillary light reflex is control by what autonomic nervous system?
pupillary light reflex is controlled by parasympathetic branch of Autonomous nervous system
What is the receptor in pupillary reflex and the effector do both change simultaneously in pupillary reflex?
The receptor in the pupillary reflex is the optic nerve, which senses changes in light intensity. The effector is the circular and radial muscles of the iris, which control the size of the pupil. In the pupillary reflex, both the receptor and the effector work together to adjust the size of the pupil to regulate the amount of light entering the eye.
What has the author Sally-Ann E Mortlock written?
Sally-Ann E. Mortlock has written: 'Role of peripheral sympathetic activity in the human pupillary light reflex'
Is the pupillary light reflex autonomic and somatic?
Yes, the pupillary light reflex is mediated by both autonomic and somatic nervous systems. The autonomic nervous system controls the constriction of the pupil in response to light, while the somatic nervous system controls the movement of the muscles that dilate and constrict the pupil.
What reflexes are classified as autonomic reflexes?
The ciliospinal reflex and the pupillary light reflex are classified as autonomic reflexes.
Why does the pupillary reflex benefit you?
The pupillary reflex helps to regulate the amount of light entering the eye, allowing for optimal vision in changing light conditions. This reflex helps protect the retina from damage due to excessive light exposure and ensures that visual information is processed effectively by the brain.
What nerve acts as the afferent pathway in the pupillary reflex?
The optic nerve (cranial nerve II) carries sensory information about light intensity to the brain as part of the afferent pathway in the pupillary reflex.
What is papillary reflex?
The papillary reflex, also known as the pupillary reflex, is a response of the pupils to light. When a light is shone into one eye, both pupils should constrict due to the consensual response. This reflex helps regulate the amount of light entering the eye.
Name the division of autonomic nervous system responsible for pupillary light reflex?
The division of autonomic nervous system responsible for pupillary light reflex is the parasympathetic system. This is what causes the pupils to close down or open up in response to lighting conditions.
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.
