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22 Cards in this Set
- Front
- Back
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When one eye is illuminated in pupillary light reflex
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Both eyes constrict
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The afferent nerve of the pupilary light reflex is
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Optic Nerve (CN2)
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The site of termination of the afferents involved in the pupilary light reflex
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Pre tectal nucleus
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The nucleus of origin of the efferent nerve of the pupilarly light reflex
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Edinger Westphal nucleus
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The efferent nerve of the pupilary light reflex is
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Parasymptathetic part of occulommotor (CN3)
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In Myopia
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Shortsightedness, focus comes before retina, corrected concave lenses
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In presbyopia
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age related loss ability to focus lens, through either crystalisation (intrinsic) or loss of cilary muscle tone.
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Ptosis occurs as a result of
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Lesion of oculomotor nerve
Horners syndrome, lesion or cervical ganglion (maybe due to pancoast tumor in apex of lung) causing loss of sympathetic (Alpha mediated) tone |
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Glaucoma is raised pressure in the eyeball; it is caused by
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blockage of canal of schlemm leading to impaired aqueous humor drainage and rise in intraocular pressure
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Monocular scotoma (blind patch in one eye)
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lesion in primary visual cortex (ocipital lobe)
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Complete monocular blindness
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optic nerve lesion
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Bitemporal hemianopia (tunnel vision)
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lesion of optic chasm
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Right homonymous hemianopia
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left optic tract lesion
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Homonymous hemianopia with sparing of foveal vision (macular
sparing) |
ocipital lesions
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Fibres which do not cross in the optic chiasm
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nasal fibres
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The effect of a lesion of the left optic tract
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HOMONYMOUS HEMIANOPIA ON RIGHT SIDE
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The pathway between the optic chiasm and the lateral geniculate nucleus
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optic tract
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The group of ganglion cell axons involved in colour vision
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Koniocellular cells (or ventral ocipital cortex)
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The principal artery supplying the primary visual cortex
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posterior cerebral
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Fibre tract involved in vestibulo-ocular reflex
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longitudinal fasciulus
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Nucleus controlling the medial rectus muscle of the eye
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oculomotor
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The transmitter in the iris which causes dilation of the pupil
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NE on alpha receptors dilator pupilae via sympathetic activation
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