visual pathway -...
TRANSCRIPT
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VISUAL PATHWAY
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Primary Visual Cortex
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Hemi - anopia
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Text Fig. 20-15
Right hemisphere
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Quadrant - anopia
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Pupillary Light
Reflex
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Olivary pretectal nucleus
Edinger-Westphal
nucleus
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??!
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Medical Terminology
direct and consensual pupillary
reflex
The direct response is the change in
pupil size in the eye to which the light is
shined to (e.g., if the light is shone in the
right eye, the right pupil constricts).
A consensual reflex in the contralateral
eye, if light shines into the right eye,
constriction of the left pupil will occur, and
this is a consensual pupillary reflex
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relative afferent pupillary defect
(RAPD)
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relative afferent pupillary defect (RAPD)
swinging-flashlight test
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relative afferent pupillary defect (RAPD)
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relative afferent pupillary defect (RAPD)
Usually before the chiasm problem
Retinal detachment
Ischemic retina
Optic nerve : ischemia ,compression neuritis ,
recovered neuritis … etc
diabetic retinopathy
Demyelination (MS)
Unilateral Optic track lesion
Unilateral mid brain lesion
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Accommodation and
parasympathetic
The pupil near reflex
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Pupillary Adjustment
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extrastriatal
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light-near dissociation
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light-near dissociation• Adie’s tonic pupil
• Damage to the dorsal mid-brain (pretectal area) around
the cerebral aqueduct “but not the E W nucleus”
• Stroke
• Meningitis
• Tumor
• Neurosyphilis
• Diabetic neuropathy
• Demyelination (MS)
• Dorsal midbrain syndrome
(Parinaud's Syndrome)
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Ganglionic Cells Subtypes
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XY
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Lateral geniculate nucleus
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Lateral geniculate nucleus
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Lateral geniculate nucleus
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Lateral geniculate nucleus
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Lateral geniculate nucleus
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Parvocellular systemMagnocellular system
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Ventral “What” pathway
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Ventral “What” pathway
• Carries information about static object properties such as colour,
luminance, stereopsis and pattern recognition.
• Slow pathway from P-ganglion cells (through laminae 3-6 of LGN, V1)
to V2, V4 and inferior temporal cortex
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Dorsal “Where” pathway
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Dorsal “Where” pathway
• Information about dynamic object properties- motion and spatial
relationships
• Fast pathway for transient visual signals
• Pathway to V1, V2, MT, medial superior temporal and parietal lobe