What causes consensual pupillary response?
Pupillary reflexes involve the autonomic (Edinger-Westphal) component of the oculomotor nucleus. In the light reflex, the pupils constrict when light is shone on the retina. If one eye only is stimulated, both pupils constrict, the so-called consensual reflex.
Which cranial nerve controls pupillary response?
What is the function CN III? Each one of the two 3rd cranial nerves controls the parasympathetic response of the pupil on the same side (ipsilateral). The parasympathetic response of the pupil (or “return to normal”) is constriction. The 3rd cranial nerve also controls eye muscle movement.
What causes pupillary response?
The pupillary response may occur for several reasons, such as exposure to light, sexual stimulation, before sleep, or in response to a stressor. Pupillary response varies the size of the pupil of the eye via the iris dilator muscle, which dilates in response to a stressor.
What is the consensual reflex of the pupil quizlet?
Terms in this set (5) What is consensual Pupillary Light Reflex? It is the response of the eye that is not being stimulated by light.
What is direct and consensual pupillary reflex?
A direct pupillary reflex is pupillary response to light that enters the ipsilateral (same) eye. A consensual pupillary reflex is response of a pupil to light that enters the contralateral (opposite) eye.
What does the Abducens nerve do?
Cranial nerve six (CN VI), also known as the abducens nerve, is one of the nerves responsible for the extraocular motor functions of the eye, along with the oculomotor nerve (CN III) and the trochlear nerve (CN IV).
Is pupillary reflex sympathetic or parasympathetic?
Pupillary Control: The Basics The physiology behind a “normal” pupillary constriction is a balance between the sympathetic and parasympathetic nervous systems. Parasympathetic innervation leads to pupillary constriction. A circular muscle called the sphincter pupillae accomplishes this task.
What is the difference between the pupillary and consensual reflexes?
Which of the following statements is an example of the consensual light reflex quizlet?
Which of the following statements is an example of the consensual light reflex? The pupil of the right eye constricts while shining a flashlight into the left eye.
How do you assess consensual reactions?
Swing a light back and forth in front of the two pupils and compare the reaction to stimulation in both eyes. When light reaches a pupil there should be a normal direct and consensual response.
What nervous system dilates pupils?
The iris dilator muscle is controlled by the sympathetic nervous system, the part of the autonomic nervous system that is involved in arousal, wakefulness, and the fight-or-flight response; the link between pupil dilation and the sympathetic nervous system explains why pupils are relatively large when someone is …
Which sympathetic receptor is responsible for pupil dilation?
Sympathetic stimulation of the adrenergic receptors causes the contraction of the radial muscle and subsequent dilation of the pupil. Conversely, parasympathetic stimulation causes contraction of the circular muscle and constriction of the pupil.
Which part of the autonomic nervous system causes pupil dilation?
Stimulation of the autonomic nervous system’s sympathetic branch, known for triggering “fight or flight” responses when the body is under stress, induces pupil dilation. Whereas stimulation of the parasympathetic system, known for “rest and digest” functions, causes constriction.
Why does the pupillary reflex lead to a consensual reflex quizlet?
The reason for the consensual light reflex is because nerve fibers project bilaterally to an oculomotor complex that sends efferent fibers to join with both oculomotor nerves.
Was the pupillary consensual response contralateral?
The right pupil also contracts. The contralateral (consensual) reflex indicates that there is some connection between the pathways for each eye. This is a test of the parasympathetic nervous system. These responses protect the retina from damage by bright light.
What is the difference between oculomotor and trochlear?
While the oculomotor nerve supplies most of the extraocular muscles, the trochlear and abducens nerves each supply their own muscle.