Eye histology

Question 1

Layers of eye ?

Answer 1

1- external: sclera , cornea & limbus
2- mid layer: uvea ,( coroid, ciliar object, iris
3- internal layer : retina

Question 2

T. Fibrosa?

Answer 2

External layer

Question 3

T. Vasculosa ?

Answer 3

Mid layer

Question 4

T. nervosa

Answer 4

Retina

Question 5

Eye sections ?

Answer 5

1 -front room: cornea, iris lens
2- back room: iris, ciliar object , zondler ligament , lens aqueous humour)
3- corpus vitreum: lens, zonular ligament , retina (vitrous humour )

Question 6

Develops from surface ectoderm ?

Answer 6

Lens, cornea epithelium , conjunctiva epithelium, tear glands

Question 7

Originates from neural ectoderm

Answer 7

Retina, iris , ciliar object epithelium , pupil muscles , optic nerve

Question 8

Originates from mesoderm?

Answer 8

Sclera, iris , ciliar object , cornea stroma , coroid optic nerve , vitrous object orbita

Question 9

T.fibrosa ?

Answer 9

Sclera & cornea

Question 10

Sclera?

Answer 10

3 layers
No vein
5/6 of eye

Question 11

Sclera layers?

Answer 11

1- episclera
2- substantia propria (tennon capsule)
3- supracoroidal lamina (connects coroid)

Question 12

Cornea layers?

Answer 12

1-cornea epithelium
2-bowman membran
3- stroma or substantia propria
4- descement membran
5- cornea endothel

Question 13

Cornea layer 1,2?

Answer 13

1- cornea epithel: multilayer non-cheratinised epithel , many free nerve ending
2- bowman membran: bacterial invasion

Question 14

Cornea layer 3,4, 5?

Answer 14

3- stroma (sp): thin collagen , no vein , few lymphosyte
4- descement membran
5- cornea endothel (limited regeneration)

Question 15

Limbus ? Duct ?

Answer 15

Corneoscleral connection

Schlemn duct

Question 16

Aqueous humour generated by?

Answer 16

Corpus ciliare;pars plicesta

Question 17

Tunica vasculosa ?

Answer 17

uvea
1 -coroid
2- corpus ciliare
3-iris

Question 18

Coroid layers ?

Answer 18

1- brush membran (retina’s pigmented epithel)
2- coriocapiller : nutrities retina
3- coroid stroma :rich by vein

Question 19

Corpus ciliare structures?

Answer 19

1- stroma
Ext. layer
Internal vascular area
Shortens the length of circular lens ligament
2 - neuro epithel
Pigmente epithel : faces stroma
Non-pigmented : faces back door, continues with sensorial retina

Question 20

Iris?

Answer 20

Continuation of ciliar object

Between front and back doors

Question 21

Iris sides?

Answer 21

1-front face : mesenchima originated
2- back face : contains much pigmented cell
3- stroma

Question 22

Lens parts ?

Answer 22

A-lens capsule (rich by collagen type 4)
B-lens epithel( subcapsular epithel)
C-lens fibrils (contains kristallin , flensin)

Question 23

Acodomation ?

Answer 23

To see near, ciliar muscles strain

Question 24

Corpus vitroum (vitrous object) ?

Answer 24

Behind of lens

Contains collagen and hyaluronic acid

Question 25

Tunica nervosa?

Answer 25

Retina

Question 26

Retina parts?

Answer 26

1- external non-sensorial: single layered , melanin granulled 2- Internal sensorial retina

Question 27

Retina structunes?

Answer 27

1- central fovea : where light concantrades | 2- macula lutea: yellow frame that surrounds fovea

Question 28

External non-sensorial retina?

Answer 28

Sits on brush membran Contains much mithocondria Wraps external part of photoreceptors Stores vit a

Question 29

Sensorial retina?

Answer 29

1- photoreceptor neurons: cone & rode 2- transmitting neurons: bipolar & ganglion 3-related neurons: horizontal & amacrin 4- neuroglia : müller

Question 30

Layers of sensorial retina ?

Answer 30

``` 1- retina pigment epithel 2- rod & cone section 3- external limiting membran 4- external nuclear layer 5- external plexiform layer 6- internal nuclear layer 7- internal plexiform 8-ganglion cell layer 9- neural fibril layer 10-internal limiting membran ```

Question 31

Rod external section?

Answer 31

600-1000 disc Discs contains rodopsin High sensitivity for light

Question 32

Cone external section?

Answer 32

Contains iodopsin | Low sensitibility for light

Question 33

Rod internal segment?

Answer 33

A- elypsoid part : acidophylic , many mithocondria | B- myoid part: basophylic ,rapid protein synthesis , much glycogene less mithocondria

Question 34

Cone internal section

Answer 34

A- more mc then rod | B- myoid : same with rod

Question 35

External nuclear layer contains?

Answer 35

Rod & cone cell bodies and cores

Question 36

External plexiform layer contains ?

Answer 36

Synapses with horizontal and bipolars

Question 37

Internal nuclear layer contains?

Answer 37

Bipolar, horizontal, amacrin , müller

Question 38

Internal plexiform contains?

Answer 38

Bipolar - ganglion synapse

Question 39

where is Bipolar cells ?

Answer 39

Between inner and outer plexiform layer

Question 40

Where is ganglion cell?

Answer 40

Ganglion cell layer

Question 41

Horizontal cell ?

Answer 41

In inner nuclear layer | h1-rod h2cone

Question 42

Amacrin cells

Answer 42

No axon Notched nucleus In inner nuclear layer Modifies bipolar cell impulses

Question 43

Neuroglial character cells?

Answer 43

1- müller 2- astrocyte 3- perivascular glia cell 4- retikulo endotelial microglial cell

Question 44

Eye lid faces ?

Answer 44

Inner: covered with palpebral conjunctiva Contains cellula calciformis between epithel cells (Restricts vaporizing) Outer : multilayered cheratinised epithel