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HISTOLOGI
MATA
Ika Fidianingsih
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Chambers of Eye
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outer: corneo scleral
Middle: Uvea with its
choroid, ciliary body and Iris
Inner: Retina has two layers
(outer pigment and inner
neuronal)
Layers
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7CORNEA
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Histology of Cornea
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Histology of Corneo scleral coat
Cornea
How cornea is transparent?
By precise regulation of water in stroma, if there is
endothelial damage corneal edema and corneal opacity
avascular
Sclera
Dense connective tissue of flat collagen fibers and
meshwork of elastic fibers
Limbus transition zone
Has irido- corneal angle for drainage of aqueous humor (
canal of schlemn)
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10Choroid & Sclera
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outer: corneo scleral
Middle: Uvea with its
choroid, ciliary body and Iris
Inner: Retina has two layers
(outer pigment and inner
neuronal)
Layers
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Vascular coat (Uvea)
Iris- most anterior part, forms diaphragm, pupil is central
aperture, posterior pigment epithelium and myoepithelial
layer next,Muscle of adaptation
Sphincter pupillae circular band of SMC, parasympathetic control ( CN
III), causes reduced size of pupil in response to light
Dilator pupillae radially oriented pigmented myoepithelial cells, form
anterior pigment epithelium, under sympathetic control (superior cervical
ganglion), causes increased pupillary size in response to dim light
Ciliary body
anterior part is ciliary process, has ciliary muscle with
three functional groups :
longitudinal for drainage of aqueous,
radial flatten the lens for distant vision,
circular- reduce tension on lens for near vision
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17Ciliary process
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Section of the anterior portion of the lens. The subcapsular epithelium secretes the lens capsule, which appears stained
in red. The lens capsule is a thick basement membrane containing collagen type IV and laminin. Below the subcapsular
epithelium, note the lens fibers, which are cells that have lost their nuclei and organelles, becoming thin, elongated,
transparent structures. Picrosirius-hematoxylin. Medium magnification.
LENS
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Crystalline lens
Transparent, avascular, biconvex,
Lens capsule type IV collagen,
New lens fibers are produced through out the life
Presbyopia
decreased elasticity and power of
accommodation with age
Cataract loss of transparency, causes can be
infections, metabolic, hereditary, trauma, UV light
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Crystalline lens
L
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outer: corneo scleral
Middle: Uvea with its
choroid, ciliary body and Iris
Inner: Retina has two layers
(outer pigment and inner
neuronal)
Layers
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1. Pigment epithelium
2. Photoreceptors outer
segments
3. Outer limiting
membrane
4. Outer nuclear layer5. Outer plexiform layer
6. Inner nuclear layer
7. Inner plexiform layer
8. Ganglion cell layer9. Nerve fiber layer
10. Inner limiting
membrane
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Retina
Rodsmore in # (12 million), more sensitive to light, used in
dim or night light), have maximum absorption at 496 nm of light (black and white pictures)
Cones less in # (7million), three classes (L,M,S), lesssensitive to light ( for day vision), have absorption at 420 (blue),
531(green) and 588 nm (red) of light, for color vision
Sel epitel pigmen :
mencegah pantulan cahaya
berisi chemical machinary untuk turnover/regenerasifotoresptor
Barier
Fagositosis
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Fovea greatest visual acuity
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Optic disk
blind spot
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Fovea greatest visual acuity
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Fovea greatest visual acuity
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