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The first 25 slides, exactly as they appear. The full deck has 39 content slides.
Ophthalmology
Anatomy and Blood Supply of Optic Nerve
Built from Khurana — Neuro-Ophthalmology
What’s inside
7 sections · 39 slides
Overview
- What you will learn in this deck
The optic nerve is a piece of brain
- What and where is the optic nerve?
- Optic nerve running from the optic disc to the chiasma
- Why it behaves like brain tissue, not a nerve
- The four parts, and how long each one is
- The optic nerve by the numbers
Inside the eye: the optic nerve head
- The intraocular part (optic nerve head)
- The four zones of the optic nerve head
- Zone 1: the surface nerve fibre layer
- Zone 2: the prelaminar region
- Zone 3: the lamina cribrosa
- Zone 4: the retrolaminar region
Behind the eye: orbit and canal
- The intraorbital part: a deliberately loose cord
- Relations of the intraorbital optic nerve
- Key relations within the orbit
- Optic nerve within the annulus of Zinn
- The intracanalicular part: squeezed in a bony tunnel
- The intracranial part: reaching the base of the brain
The wrappings: meningeal sheaths
- Three membranes, continuous with the brain's
- The three sheaths, one by one
Blood supply of the optic nerve
- Blood supply of the optic nerve head
- Feeding the optic nerve head, zone by zone
- Intraorbital part: two supply systems
- Blood supply of the intraorbital optic nerve
- Canal and skull: supply of the deeper parts
- The four feeders of the intracranial pial plexus
- Venous drainage: how blood leaves
Pulling it together
- The optic nerve at a glance
- Clinical hooks worth remembering
- Why does the optic nerve fail to regenerate after it is cut, and how does its diameter change at the eye?
- References
- Neuro-Ophthalmology