14.kuliah-histologi mata.ppt

7/27/2019 14.kuliah-histologi mata.ppt

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HISTOLOGI

MATA

Ika Fidianingsih


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Chambers of Eye


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1

2

5

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6

7


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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

2

3


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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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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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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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14.kuliah-histologi mata.ppt

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