no slide title … · axoplasmic transport –orthograde –from ganglion cell layer to lgn...
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Optic Nerve
Norm Zabriskie, MD
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Optic Nerve - Anatomy
1.2 million axons
1000 fascicles
Cell bodies – ganglion cell layer of retina
Axons synapse in the lateral geniculate
Axoplasmic transport
– Orthograde – from ganglion cell layer to LGN
– Retrograde – LGN to ganglion cell body
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Optic Nerve – Cell Types
Parvocellular (P)
– Most numerous
– Smaller diameter axons
– Sensitive to color and detail
– Smaller receptive fields
Magnocellular (M)
– Fewer in number
– Larger diameter
– May be more susceptible to glaucoma damage
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Optic Nerve – Cell Types
Bistratified Cells – Koniocellular
– Process blue-yellow
– Preferentially activated by short-wavelength
perimetry
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ILM of Retina
Prelaminar
region
Laminar
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Optic Nerve – Blood Supply
Surface NFL – CRA
Prelaminar –
peripapillary choroid
and short PCAs
Laminar – Short PCAs
Retrolaminar –
penetrating branches
of pial vessels
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