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What is the function of the pupillary light reflex quizlet?

Jim Brown

What is the function of the pupillary light reflex quizlet?

The pupillary light reflexes function to protect the retina (part of the CNS) from damage resulting from excessively bright light. mediated via the sympathetic division of the autonomic nervous system.

How does pupillary light reflex work?

Pupillary Reflex Pathways. The pupil is under competing autonomic control in response to light levels hitting the retina. The sympathetic system will dilate the pupil when the retina is not receiving enough light, and the parasympathetic system will constrict the pupil when too much light hits the retina.

What does the pupillary reflex in the human eye do quizlet?

When both pupils contract/dilate in response to a stimulus or lack of stimulus to one eye. Shining the light on one eye sends a signal to the brain telling the brain that there is a bright light and the brain responds by sending a signal to constrict both eyes. When objects are closer, pupils constrict.

What muscles are activated in the pupillary light reflex?

Smooth muscles are activated in the pupillary light reflex.

What is the response of the pupil when light is shone on it quizlet?

Both pupils dilate in response to light. Both pupils constrict in response to light.

What is the advantage of pupillary response?

What is the apparent biological advantage of the pupillary light reflex? The pupillary light reflex allows for light to enter the eye but not enough to hurt or damage the retina. It allows focus and detail reception and protection.

What part of the brain controls pupillary reflex?

oculomotor nucleus
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.

What was the response of the pupil in the opposite eye quizlet?

What was the response of the pupil in the opposite eye when light was shown on the first eye? The opposite pupil also contracts via the consensual light reflex.

Which best describes the accommodation reflex of the eye?

The accommodation reflex (or accommodation-convergence reflex) is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object (and vice versa), comprising coordinated changes in vergence, lens shape (accommodation) and pupil size.

What is the function of the pupillary light?

The pupillary light reflex is a reflex that controls the diameter of the pupil when it is exposed to varying intensities of light. This allows the eyes to adjust in response to bright or dim lights. Walk into any room and switch on the light; everything seems perfectly in its place. Now, switch off the light and try to see what is in the room.

Is the pupillary reflex direct or consensual?

The reflex is consensual: Normally light that is directed in one eye produces pupil constriction in both eyes. The direct response is the change in pupil size in the eye to which the light is directed (e.g., if the light is shone in the right eye, the right pupil constricts). Click to see full answer.

Where does the pupillary reflex take place in the retina?

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.

What are the grades for pupillary light reflex?

A 3+ grading indicates a moderate response, 2+ is a small, slowed response, 1+ represents a tiny/just visible response, and a 0 indicates unresponsive pupils. Commonly, clinicians document PERRL–saying the pupils are equal, round, and reactive to light or PEARL – pupils equal and reacting to light.

What is the function of the pupillary light reflex quizlet?

Jim Brown

What is the function of the pupillary light reflex quizlet?

The pupillary light reflexes function to protect the retina (part of the CNS) from damage resulting from excessively bright light. mediated via the sympathetic division of the autonomic nervous system.

What does no pupillary response mean?

Abnormalities such as an irregular pupil size or shape, or a delayed or nonreactive pupil can be indicative of significant head trauma. A score of 2 means both pupils are non-reactive to light; a score of 1 means one pupil is non-reactive; and a score of 0 means neither pupil is non-reactive.

What is pupillary response quizlet?

pupillary light reflex. the reduction of pupil size in response to light. pupillary accommodation reflex. the reduction of pupil size in response to an object coming close to the eye.

Why do both pupils constrict in response to light?

When the light is shone into the other, normal (less abnormal) eye, both pupils will constrict further. This is because the afferent pathway of this eye is intact, or less damaged than that of the other eye.

What is the response of the pupil when light is shone on it quizlet?

Both pupils dilate in response to light. Both pupils constrict in response to light.

How do doctors test pupillary response?

4 Your doctor will first dim the lights, then ask you to look at an object in the distance. A light will be shone into your eyes from each side. Your doctor will watch your pupils closely to determine whether or not your pupils constrict in response to the light, making note of the size and shape of your pupils.

What was the response of the pupil in the opposite eye quizlet?

What was the response of the pupil in the opposite eye when light was shown on the first eye? The opposite pupil also contracts via the consensual light reflex.

How does the pupillary response prevent injury what would happen without it?

How does the papillary response prevent injury? What would happen without it? It prevents excessive amounts of light from entering the eye. Without it, we could go blind.

What is the function of the pupillary light?

The pupillary light reflex is a reflex that controls the diameter of the pupil when it is exposed to varying intensities of light. This allows the eyes to adjust in response to bright or dim lights. Walk into any room and switch on the light; everything seems perfectly in its place. Now, switch off the light and try to see what is in the room.

Why is it important to document the pupillary response?

Documenting the pupillary response and repeatedly examining the pupillary response until the patient is stable are important. The sign of an ipsilateral dilating pupil (when previously the pupils were equal and reacting) is a sinister sign of a focal lesion, causing an increase in intracranial pressure.

Which is a physiological response to the narrowing of the pupil?

Pupillary response. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve. A constriction response ( miosis ), is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates / opioids or anti hypertension medications.

What causes the pupillary reflex to be abolished?

Quickly swinging the light across to the abnormal eye generates a weaker afferent drive to the pupil constrictor muscles ( relative to the good eye) and both pupils paradoxically dilate slightly in response to the torch beam. The pupillary reaction to light is abolished only by structural damage to the midbrain or third cranial nerve.