- 1 Kinh Nghiệm Hướng dẫn Which type of basic reflex includes the pupillary response and accommodation Chi Tiết
- 2 Terminology
- 3 Neural pathway anatomy
- 4 Clinical significance
- 5 Cognitive influences
- 6 Mathematical model
- 7 See also
- 8 References
- 9 External links
- 9.1 Which type of basic reflex includes the pupillary response?
- 9.2 What is the motor response in the light pupillary reflex quizlet?
- 9.3 Which lobe of the brain is responsible for personality and intellectual functioning?
- 9.4 Which cranial nerve would a nurse suspect is damaged when caring for a patient with drooping upper eyelids?
- 9.5 Clip Which type of basic reflex includes the pupillary response and accommodation ?
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Kinh Nghiệm Hướng dẫn Which type of basic reflex includes the pupillary response and accommodation Chi Tiết
Pro đang tìm kiếm từ khóa Which type of basic reflex includes the pupillary response and accommodation được Update vào lúc : 2022-10-05 00:59:40 . Với phương châm chia sẻ Thủ Thuật về trong nội dung bài viết một cách Chi Tiết Mới Nhất. Nếu sau khi tìm hiểu thêm nội dung bài viết vẫn ko hiểu thì hoàn toàn có thể lại Comments ở cuối bài để Ad lý giải và hướng dẫn lại nha.
Refers to the asymmetric sizes of pupils
Nội dung chính
- Relative Afferent Pupillary Defect (RAPD, Marcus Gunn Pupil)Adie’s (Tonic) PupilArgyll Robertson PupilHorner’s SyndromeMarcus Gunn PupilTerminologyNeural pathway anatomyTypes of
alsoReferencesExternal linksWhich type of basic reflex includes the pupillary response?What is the motor response in the light pupillary reflex quizlet?Which lobe of the brain is responsible for personality and intellectual functioning?Which cranial nerve would a nurse suspect is damaged when caring for a patient with drooping upper eyelids?
Physiologic anisocoria can is very common and a normal variant in up to 20% of the population. The variation should be no more than 1mm and both eyes should react to light normally.
Can be dangerous if a manifestation Horner’s syndrome (e.g. carotid dissection) or from damage to the third nerve (e.g. aneurysmal expansion)
further workup such as imaging if anisocoria is suspected to be from a pathologic process
Relative Afferent Pupillary Defect (RAPD, Marcus Gunn Pupil)
An RAPD is a defect in the direct response. It is due to damage inoptic nerve or severe retinal disease.
It is important to be able to differentiate whether a patient is complaining of decreased vision from an ocular problem such as cataract or
from a defect of the optic nerve. If an optic nerve lesion is present the affected pupil will not constrict to light when light is shone in the that pupil during the swinging flashlight test. However, it will constrict if light is shone in the other eye (consensual response). The swinging flashlight test is helpful in separating these two etiologies as only patients with optic nerve damage will have a positive RAPD.
Swinging Flashlight Test:
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.
An RAPD is diagnosed by observing paradoxical dilatation when light is directly shone in the affected pupil after being shown in the healthy pupild to be from a pathologic process
This decrease in constriction or widening of the pupil is
due to reduced stimulation of the visual pathway by the pupil on the affected side. By not being able to relay the intensity of the light as accurately as the healthy pupil and visual pathway, the diseased side causes the visual pathway to mistakenly respond to the decrease in stimulation as if the flashlight itself were less luminous. This explains the healthy eye is able to undergo both direct and consensual dilatation seen on the swinging flashlight test.
Some causes of a RAPD
optic neuritisischemic optic disease or retinal diseasesevere glaucoma causing trauma to optic nervedirect optic nerve damage (trauma, radiation, tumor)retinal detachmentvery severe macular degenerationretinal infection (CMV, herpes)
Adie’s (Tonic) Pupil
Common in women in the 3rd/4th decade of life (but also can be present in
Either no or sluggish response to light (both direct and consensual responses)
Thought to be caused from denervation in the postganglionic parasympathetic nerve
Associated with Holmes-Adie syndrome described with Adie’s pupil and absent deep tendon reflexes
Overall, this is a benign process (including Holmes-Adie syndrome)
Argyll Robertson Pupil
This lesion is a hallmark
of tertiary neurosyphillis
Pupils will NOT constrict to light but they WILL constrict with accommodation
Pupils are small baseline and usually both involved (although degree may be asymmetrical)
Loss of sympathetic innervation causing the clinical triad of:
Ptosis (drooping eyelid): The superior tarsal muscle requires sympathetic innervation to
keep the eyelid retractedMiosis (pupillary constriction): A loss of sympathetic input causes unopposed parasympathetic stimulation which leads to pupillary constriction. This degree of miosis may be subtle and require a dark room.Anhidrosis (decreased sweating): Also caused by a loss of sympathetic activity. The pattern of anihidrosis may help identify the lesion. Anhidrosis of the entire face is often associated with a lesion the level of the carotid artery.
Partial anhidrosis involving only the medial aspect of the forehead ipsilateral side of the nose is associated with a lesion distal to the carotid bulb.
Causes of Horner’s Syndrome include:
carotid artery dissectionpancoast tumors, nasopharyngial tumorslymphoproliferative disordersbrachial plexus injurycavernous sinus thrombosisfibromuscular dysplasia
Marcus Gunn Pupil
For information on the Marcus Gunn pupil, click here.
The W-shaped pupil of the cuttlefish dilating when the lights are turned off
The pupillary light
reflex (PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the
retinal ganglion cells of the retina in the back of the eye, thereby assisting in adaptation of vision to various levels of
lightness/darkness. A greater intensity of light causes the pupil to constrict (miosis/myosis; thereby allowing less light in), whereas a lower intensity of light causes the pupil to dilate (mydriasis, expansion; thereby allowing more light in). Thus, the pupillary light reflex regulates the intensity of light entering the
eye. Light shone into one eye will cause both pupils to constrict.
pupil is the dark circular opening in the center of the iris and is where light enters the eye. By analogy with a camera, the pupil is equivalent to aperture, whereas the iris is equivalent to the
diaphragm. It may be helpful to consider the Pupillary reflex as an ‘Iris’ reflex, as the iris sphincter and dilator muscles are what can be seen responding to ambient
light. Whereas, the pupil is the passive opening formed by the active iris. Pupillary reflex is synonymous with pupillary response, which may be pupillary constriction or dilation. Pupillary reflex is conceptually linked to the side (left or right) of the reacting pupil, and not to the side from which light stimulation originates. Left pupillary reflex refers to the
response of the left pupil to light, regardless of which eye is exposed to a light source. Right pupillary reflex means reaction of the right pupil, whether light is shone into the left eye, right eye, or both eyes. When light is shone into only one eye and not the other, it is normal for both pupils to constrict simultaneously. The terms direct and consensual refers to the side where the light source comes from, relative to the side of the reacting pupil. 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. Thus there are four types of pupillary light reflexes, based on this terminology of absolute laterality (left versus right) and relative laterality (same side versus opposite side, ipsilateral versus contralateral, direct versus consensual):
Left direct pupillary reflex is the left pupil’s response to
light entering the left eye, the ipsilateral eye.Left consensual pupillary reflex is the left pupil’s indirect response to light entering the right eye, the contralateral eye.Right direct pupillary reflex is the right pupil’s response to light entering the right eye, the ipsilateral eye.Right consensual pupillary reflex is the right pupil’s indirect response to light entering the left eye, the contralateral eye.
Neural pathway anatomy
The pupillary light reflex neural pathway on each side has an afferent limb and two efferent limbs. The afferent limb has nerve fibers running within the optic nerve
(CN II). Each efferent limb has nerve fibers running along the oculomotor nerve (CN III). The afferent limb carries sensory input. Anatomically, the afferent limb consists of the retina, the optic nerve, and the pretectal nucleus in
the midbrain, level of superior colliculus. Ganglion cells of the retina project fibers through the optic nerve to the ipsilateral pretectal nucleus. The efferent limb is the pupillary motor output from the pretectal nucleus to the ciliary sphincter muscle of the iris. The pretectal nucleus projects crossed and uncrossed fibers to the ipsilateral and contralateral Edinger-Westphal
nuclei, which are also located in the midbrain. Each Edinger-Westphal nucleus gives rise to preganglionic parasympathetic fibers which exit with CN III and synapse with postganglionic parasympathetic neurons in the ciliary ganglion. Postganglionic nerve fibers leave the ciliary ganglion to innervate the ciliary sphincter. Each
afferent limb has two efferent limbs, one ipsilateral and one contralateral. The ipsilateral efferent limb transmits nerve signals for direct light reflex of the ipsilateral pupil. The contralateral efferent limb causes consensual light reflex of the contralateral pupil.
The optic nerve, or more precisely, the photosensitive
ganglion cells through the retinohypothalamic tract, is responsible for the afferent limb of the pupillary reflex; it senses the incoming light. The oculomotor nerve is responsible
for the efferent limb of the pupillary reflex; it drives the iris muscles that constrict the pupil.
Retina: The pupillary reflex pathway begins with the photosensitive
retinal ganglion cells, which convey information via the optic nerve, the most peripheral, distal, portion of which is the optic disc. Some axons of the optic nerve connect to the
pretectal nucleus of the upper midbrain instead of the cells of the lateral geniculate nucleus (which project to the
primary visual cortex). These intrinsic photosensitive ganglion cells are also referred to as melanopsin-containing cells, and they influence circadian rhythms as well as the pupillary light reflex.Pretectal nuclei: From the neuronal cell bodies in some of the pretectal
nuclei, axons synapse on (connect to) neurons in the Edinger-Westphal nucleus. Those neurons are the preganglionic cells with axons that run in the oculomotor nerves to the ciliary ganglia.Edinger-Westphal
nuclei: Parasympathetic neuronal axons in the oculomotor nerve synapse on ciliary ganglion neurons.Ciliary ganglia: Short post-ganglionic ciliary nerves leave the ciliary ganglion to innervate the
Iris sphincter muscle of the iris.
Referring to the neural pathway schematic diagram, the entire pupillary light reflex system can be visualized as having eight neural segments, numbered 1 through 8. Odd-numbered segments 1, 3, 5, and 7 are on the left. Even-numbered segments 2, 4, 6, and 8 are on
the right. Segments 1 and 2 each includes both the retina and the optic nerve (cranial Nerve #2). Segments 3 and 4 are nerve fibers that cross from the pretectal nucleus on one side to the Edinger-Westphal nucleus on the contralateral side. Segments 5 and 6 are fibers that connect the pretectal nucleus on one side to the Edinger-Westphal nucleus on the same side. Segments 3, 4, 5, and 6 are all located within a compact region within the midbrain. Segments 7 and 8 each contains parasympathetic
fibers that courses from the Edinger-Westphal nucleus, through the ciliary ganglion, along the oculomotor nerve (cranial nerve #3), to the ciliary sphincter, the muscular structure within the iris.
Schematic diagram of pupillary light reflex neural pathway
- Left direct light reflex involves neural segments 1, 5,
and 7. Segment 1 is the afferent limb, which includes the retina and optic nerve. Segments 5 and 7 form the efferent limb.Left consensual light reflex involves neural segments 2, 4, and 7. Segment 2 is the afferent limb. Segments 4 and 7 form the efferent limb.Right direct light reflex involves neural segments 2, 6, and 8. Segment 2 is the afferent limb. Segments 6 and 8 form the efferent limb.Right consensual light reflex involves neural segments 1, 3, and 8. Segment
1 is the afferent limb. Segments 3 and 8 form the efferent limb.
The diagram may assist in localizing lesion within the pupillary reflex system by process of elimination, using light reflex testing results obtained by clinical examination.
Pupillary light reflex provides a useful diagnostic tool for testing the integrity of the sensory and motor functions of the eye. Emergency physicians
routinely test pupillary light reflex to assess brain stem function. Abnormal pupillary reflex can be found in optic nerve injury, oculomotor nerve damage, brain stem lesion (including brain stem death), and depressant drugs, such as
barbiturates. Examples are provided as below:
nerve damage on the left (e.g. transection of left optic nerve, CN II, somewhere between retina and optic chiasma, therefore damaging the left afferent limb, leaving the rest of the pupillary light reflex neural pathway on both sides intact) will have the following clinical findings:
- The left direct reflex is lost. When the left eye is stimulated by light, neither pupils constrict.
Afferent signals from the left eye cannot pass through the transected left optic nerve to reach the intact efferent limb on the left.The right consensual reflex is lost. When left eye is stimulated by light, afferent signals from the left eye cannot pass through the transected left optic nerve to reach the intact efferent limb on the right.The right direct reflex is intact. Direct light reflex of right pupil involves the right optic nerve and right oculomotor nerve, which are
both intact.The left consensual reflex is intact. Consensual light reflex of left pupil involves the right optic nerve and left oculomotor nerve, which are both undamaged.
Oculomotor nerve damage on the left (e.g. transection of left oculomotor nerve, CN III, therefore damaging the left efferent limb) will have the following clinical findings:
- The left direct
reflex is lost. When the left eye is stimulated by light, left pupil does not constrict, because the efferent signals cannot pass from midbrain, through left CN III, to the left pupillary sphincter.The right consensual reflex is intact. When the left eye is stimulated by light, the right pupil constricts, because the afferent limb on the left and the efferent limb on the right are both intact.The right direct reflex is intact. When light is shone into right eye, right pupil
constricts. Direct reflex of the right pupil is unaffected, The right afferent limb, right CN II, and the right efferent limb, right CN III, are both intact.The left consensual reflex is lost. When the right eye is stimulated by light, left pupil does not constrict consensually. Right afferent limb is intact, but left efferent limb, left CN III, is damaged.
For example, in a person with abnormal left direct reflex and abnormal right consensual reflex (with normal left consensual and normal right direct reflexes), which would produce a left
Marcus Gunn pupil, or what is called left afferent pupillary defect, by physical examination. Location of the lesion can be deduced as follows:
Left consensual reflex is normal, therefore segments 2, 4, and 7 are normal. Lesion is not located in any of these segments.Right direct reflex is normal, therefore segments 2, 6, and 8 are normal. Combining with earlier normals,
segments 2, 4, 6, 7, and 8 are all normal.Remaining segments where lesion may be located are segments 1, 3, and 5. Possible combinations and permutations are: (a) segment 1 only, (b) segment 3 only, (c) segment 5 only, (d) combination of segments 1 and 3, (e) combination of segments 1 and 5, (f) combination of segments 3 and 5, and (g) combination of segments 1, 3, and 5.Options (b) and (c) are eliminated because isolated lesion in segment 3 alone or in segment 5 alone cannot
produce the light reflex abnormalities in question.A single lesion anywhere along segment 1, the left afferent limb, which includes the left retina, left optic nerve, and left pretectal nucleus, can produce the light reflex abnormalities observed. Examples of segment 1 pathologies include left optic neuritis (inflammation or infection of the left optic nerve), detachment of left retina, and an isolated small stroke involving only the left pretectal nucleus. Therefore, options (a), (d),
(e), (f), and (g) are possible.A combined lesion in segments 3 and 5 as cause of defect is very unlikely. Microscopically precise strokes in the midbrain, involving the left pretectal nucleus, bilateral Edinger-Westphal nuclei, and their interconnecting fibers, could theoretically produce this result. Furthermore, segment 4 shares the same anatomical space in the midbrain as segment 3, therefore segment 4 will likely be affected if segment 3 is damaged. In this setting, it is very
unlikely that left consensual reflex, which requires an intact segment 4, would be preserved. Therefore, options (d), (f), and (g), which all includes segment 3, are eliminated. Remaining possible options are (a) and (e).Based on the above reasoning, the lesion must involve segment 1. Damage to segment 5 may accompany a segment 1 lesion, but is unnecessary for producing the abnormal light reflex results in this case. Option (e) involves a combined lesion of segments 1 and 5. Multiple
sclerosis, which often affects multiple neurologic sites simultaneously, could potentially cause this combination lesion. In all probability, option (a) is the answer. Neuro-imaging, such as MRI scan, would be useful for confirmation of clinical findings.
The pupillary response to light is not purely reflexive, but is modulated by cognitive factors, such as attention, awareness, and the way visual input is interpreted. For example,
if a bright stimulus is presented to one eye, and a dark stimulus to the other eye, perception alternates between the two eyes (i.e., binocular rivalry): Sometimes the dark stimulus is perceived, sometimes the bright stimulus, but never both the same time. Using this technique, it has been shown the pupil is smaller when a bright stimulus dominates awareness, relative to when a dark
stimulus dominates awareness. This shows that the pupillary light reflex is modulated by visual awareness. Similarly, it has been shown that the pupil constricts when you covertly (i.e., without looking ) pay attention to a bright stimulus,
compared to a dark stimulus, even when visual input is identical. Moreover, the magnitude of the pupillary light reflex
following a distracting probe is strongly correlated with the extent to which the probe captures visual attention and interferes with task performance. This shows that the pupillary light reflex is modulated by visual attention and trial-by-trial variation in visual attention. Finally, a picture that is subjectively perceived as bright (e.g. a picture of the sun),
elicits a stronger pupillary constriction than an image that is perceived as less bright (e.g. a picture of an indoor scene), even when the objective brightness of both images is equal. This shows that the pupillary light reflex is modulated by
subjective (as opposed to objective) brightness.
Pupillary light reflex is modeled as a physiologically-based non-linear delay differential equation that describes the changes in the pupil diameter as a function of the
is the pupil diameter measured in millimeters and is the luminous intensity reaching the retina in a time
, which can be described as : luminance reaching the eye in lumens/mm2 times the pupil area in mm2.
is the pupillary latency, a time delay between the instant in which the light pulse reaches the retina and the beginning of iridal reaction due nerve transmission, neuro-muscular excitation and activation delays. , and are the derivatives for the function, pupil diameter and time .
Since the pupil constriction velocity is approximately 3 times faster than (re)dilation
velocity, different step sizes in the numerical solver simulation must be used:
are respectively the for constriction and dilation measured in milliseconds,
and are respectively the current and previous simulation times (times since the simulation started) measured in milliseconds,
is a constant that affects the constriction/dilation velocity and varies among individuals. The higher the value, the smaller the time step used in the simulation and, consequently, the smaller the
pupil constriction/dilation velocity.
In order to improve the realism of the resulting simulations, the hippus effect can be approximated by adding small random variations to the environment light (in the range 0.05–0.3 Hz).
- PupilPupillary responseSlit lamp
a b c
d Purves, Dale, George J. Augustine, David Fitzpatrick, William C. Hall, Anthony-Samuel LaMantia, James O. McNamara, and Leonard E. White (2008). Neuroscience. 4th ed. Sinauer Associates.
pp. 290–1. ISBN 978-0-87893-697-7.cite book:
CS1 maint: multiple names: authors list (link)^ Hall, Charlotte; Chilcott, Robert (2022).
“Eyeing up the Future of the Pupillary Light Reflex in Neurodiagnostics”. Diagnostics. 8 (1): 19. doi:10.3390/diagnostics8010019.
PMC 5872002. PMID 29534018.
^ Kaufman, Paul L.; Levin, Leonard A.; Alm, Albert (2011). Adler’s Physiology of the Eye. Elsevier Health Sciences. p.. 508.
^ “Pupillary Light Reflex”. StatPearls. StatPearls.
Ciuffreda, K. J.; Joshi, N. R.; Truong, J. Q.. (2022). “Understanding the effects of mild traumatic brain injury on the pupillary light reflex”. Concussion. 2 (3): CNC36.
doi:10.2217/cnc-2022-0029. PMC 6094691.
^ Harms, H. (1937). “Ort und Wesen der Bildhemmung bei Schielenden”. Graefe’s Archive for Clinical and Experimental Ophthalmology. 138 (1): 149–210.
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^ Naber M., Frassle, S. Einhaüser W. (2011). “Perceptual rivalry: Reflexes reveal the gradual nature of visual awareness”. PLOS ONE. 6 (6): e2011.
doi:10.1371/journal.pone.0020910. PMC 3109001. PMID 21677786.cite journal:
CS1 maint: multiple names: authors list (link)^ Binda P.; Pereverzeva M.; Murray S.O. (2013).
“Attention to bright surfaces enhances the pupillary light reflex”. Journal of Neuroscience. 33 (5): 2199–2204. doi:10.1523/jneurosci.3440-12.2013.
PMC 6619119. PMID 23365255.
^ Mathôt S., van der Linden, L. Grainger, J. Vitu, F. (2013). “The pupillary response to light reflects the focus of covert visual attention”. PLOS ONE. 8 (10): e78168.
doi:10.1371/journal.pone.0078168. PMC 3812139. PMID 24205144.cite journal:
CS1 maint: multiple names: authors list (link)^ Mathôt S., Dalmaijer E., Grainger J., Van
der Stigchel, S. (2014). “The pupillary light response reflects exogenous attention and inhibition of return” (PDF). Journal of Vision. 14 (14): e7. doi:10.1167/14.14.7.
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CS1 maint: multiple names: authors list (link)^ Ebitz R.; Pearson J.; Platt M. (2014).
“Pupil size and social vigilance in rhesus macaques”. Frontiers in Neuroscience. 8 (100): 100. doi:10.3389/fnins.2014.00100.
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- Animation of pupillary light reflexReflex,+Pupillary the US National Library of Medicine Medical Subject Headings (MeSH)A pupil examination simulator,
demonstrating the changes in pupil reactions for various nerve lesions.
Which type of basic reflex includes the pupillary response?
The pupillary light reflex is an autonomic reflex that constricts the pupil in response to light, thereby adjusting the amount of light that reaches the retina. Pupillary constriction occurs via innervation of the iris sphincter muscle, which is controlled by the parasympathetic system.
What is the motor response in the light pupillary reflex quizlet?
The pupillary reflex results when light is directed into the pupil of one eye. The pupil should respond by getting smaller caused by the contraction of the constrictor muscles in the iris.
Which lobe of the brain is responsible for personality and intellectual functioning?
The frontal lobes are considered our behaviour and emotional control centre and home to our personality. There is no other part of the brain where lesions can cause such a wide variety of symptoms. Damage to the frontal lobes can result in: Loss of simple movement of various body toàn thân parts (Paralysis)
Which cranial nerve would a nurse suspect is damaged when caring for a patient with drooping upper eyelids?
The third cranial nerve also controls elevation of the eyelid. Observe for ptosis (drooping of the upper eyelids) as can be seen in lesions of the third nerve, Horner’s syndrome (ptosis, miosis, and decreased ipsilateral facial sweating caused by sympathetic lesions), or muscle diseases such as myasthenia gravis.
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