Podcast
Questions and Answers
What are the two main layers of the retina?
What are the two main layers of the retina?
- The optic nerve and the macula
- The RPE and the choroid (correct)
- The vitreous humor and the aqueous humor
- The neurosensory layer and the sclera
What is the function of the RPE?
What is the function of the RPE?
- To recycle used photopigments (correct)
- To provide blood supply to the inner retina
- To convert light energy into a nerve impulse
- To reflect light rays so the retina receives light twice
What is the role of photoreceptors in the retina?
What is the role of photoreceptors in the retina?
- To provide blood supply to the inner retina
- To convert light energy into a nerve impulse (correct)
- To recycle used photopigments
- To reflect light rays so the retina receives light twice
What is the optic nerve made up of?
What is the optic nerve made up of?
What is the fundus?
What is the fundus?
What is the dual blood supply of the retina?
What is the dual blood supply of the retina?
What affects the appearance of the fundus?
What affects the appearance of the fundus?
Flashcards
Retina layers
Retina layers
The retina has two main layers: RPE and choroid.
RPE function
RPE function
The RPE recycles used photopigments.
Photoreceptor role
Photoreceptor role
Photoreceptors convert light energy to nerve impulses.
Optic nerve composition
Optic nerve composition
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Fundus definition
Fundus definition
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Retinal blood supply
Retinal blood supply
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Fundus appearance factors
Fundus appearance factors
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Study Notes
- The retina has 10 layers, but can be simplified into 2 layers: the RPE and the neurosensory layer.
- The RPE is essential for retinal integrity and function, and recycles used photopigments.
- Photoreceptors, including rods and cones, contain visual pigments and convert light energy into a nerve impulse.
- The optic nerve is part of the CNS and consists of axons of ganglion cells.
- The fundus is the portion of the posterior segment of the eye that is viewed with the ophthalmoscope.
- The retina has a dual blood supply: retinal blood vessels for inner retina and choroidal blood vessels for outer retina.
- Different species have different arrangements of blood vessels affecting the appearance of the fundus.
- The tapetum is part of the choroid and reflects light rays so the retina receives light twice.
- The appearance of the fundus depends on overall pigment in an individual, including coat color, iris color, and fundus color.
- Normal fundus variations depend on the color of different layers, with less coat pigment leading to a paler fundus.
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