pupils Flashcards
Light traveling from eye to brain
Afferent pathway (direct response)
Afferent pathway
Ganglion cells Optic nerve optic chiasm optic tracts pretectal nuclei midbrain posterior commissure crossing edinger-westphal nuclei
Efferent pathway
Edinger-westpahl nuclei oculomotor cnIII Ciliary ganglion Short posterior nerves Choroid, iris sphincter, ciliary body
Anisocoria
Unequal size in pupils
Asymmetry in dark
One pupil cannot dilate
Sympathetic nervous system defect
Asymmetry in light
One pupil cannot constrict
Parasympathetic nervous system defect
Constricted pupil anomalies
Horners syndrome Argyll robertson pupil iris corneal irritation pharemeceutical street drugs
Horners syndrome
Lack of sympathetic innervation
signs = miosis, ptosis, anhydrosis
Argyll Robertson pupil
CNS syphilis and has bi lateral pupil constriction unequal in size or shape. Pupils won’t dilate.
3rd nerve palsy signs
Dilated pupil w no RL direct or consensual, ptosis, tropia
Swinging flash light test is done to check for ___ which aka ____
RAPD
Marcus gunn pupil
A fixed non-reactive pupil ____
Can be very dangerous
Dilated pupil anomalies
Nerve damage on efferent PS pathway Trauma to iris sphincter aneurysm of posterior communicating artery 3rd cranial nerve palsy adies tonic pupil pharmaceutical severe affection of retina or Optic nerve acute narrow angle glaucoma attack amaurotic pupil
Anisocoria worse in light due to lack of ____ innervation to sphincter muscle pupil won’t constrict
Parasympathetic
3rd nerve palsy signs
Dilated pupil w no direct or consensual or accomadtive reaction
ptosis
Tropia (eye out and down)
