Histology of the Visual System - Busch Flashcards
Parts of the outer tunic
Sclera - opaque, absorbs light
Cornea - transparent
Limbus - connects the two
Fxn - protect inner eye, maintains shape and consistency
Parts of the middle tunic (uvea)
Iris - outlines the pupil Ciliary body - m to dilate and constrict iris Ciliary process Choroid - vascular, pigmented Suspensory ligaments - accommodation
Parts of the inner tunic
Outer pigmented layer Retina Macula lutea Fovea - only cones Papilla - optic disc
Layers of the cornea
Corneal epithelium Bowman's layer Stroma Descemet's membrane Corneal endothelium
What type of cells anchor the corneal epithelium to Bowman’s layer?
Hemidesmosomes
What layer of the cornea transport materials from aq humor to Descemet’s membrane?
Corneal endothelium
–also lots of mito here
What type of cells found in Stroma layer of cornea? Which NS?
Myelinated nerves, collagen lamellae, fibroblasts
PNS!! Schwann cells
Where do nerves become unmyelinated in cornea?
Bowman’s layer
What in the cornea is responsible for neutralizing O2?
Corneal endothelium
glutathione pathway neutralizes excess O2
Who is gonna kick this test’s ass?!?!
WE ARE!!!!
Seriously. We got this.
What is the most common type of tissue allotransplantation?
Corneal transplant
Success > 90%
What layer in the eyeball is vascular and what tunic is it associated with?
Choroid
Middle tunic
Also pigmented
When you are squinting at Kyle’s lecture trying to read crappy screen shots of the book, what is your eye doing?
It is accommodating - to see better
Ciliary m contracted
Suspensory fibers relaxed
Lens is round
What happens to your eye in bright light?
Pupil constricts - ciliary m of iris contract
Parasymp
What happens to your eye in dim light?
Pupil dilates - radial m of iris contracts - pulls it open
Symp