Eye histology Flashcards
Layers of eye ?
1- external: sclera , cornea & limbus
2- mid layer: uvea ,( coroid, ciliar object, iris
3- internal layer : retina
T. Fibrosa?
External layer
T. Vasculosa ?
Mid layer
T. nervosa
Retina
Eye sections ?
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 )
Develops from surface ectoderm ?
Lens, cornea epithelium , conjunctiva epithelium, tear glands
Originates from neural ectoderm
Retina, iris , ciliar object epithelium , pupil muscles , optic nerve
Originates from mesoderm?
Sclera, iris , ciliar object , cornea stroma , coroid optic nerve , vitrous object orbita
T.fibrosa ?
Sclera & cornea
Sclera?
3 layers
No vein
5/6 of eye
Sclera layers?
1- episclera
2- substantia propria (tennon capsule)
3- supracoroidal lamina (connects coroid)
Cornea layers?
1-cornea epithelium 2-bowman membran 3- stroma or substantia propria 4- descement membran 5- cornea endothel
Cornea layer 1,2?
1- cornea epithel: multilayer non-cheratinised epithel , many free nerve ending
2- bowman membran: bacterial invasion
Cornea layer 3,4, 5?
3- stroma (sp): thin collagen , no vein , few lymphosyte
4- descement membran
5- cornea endothel (limited regeneration)
Limbus ? Duct ?
Corneoscleral connection
Schlemn duct
Aqueous humour generated by?
Corpus ciliare;pars plicesta
Tunica vasculosa ?
uvea
1 -coroid
2- corpus ciliare
3-iris
Coroid layers ?
1- brush membran (retina’s pigmented epithel)
2- coriocapiller : nutrities retina
3- coroid stroma :rich by vein
Corpus ciliare structures?
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
Iris?
Continuation of ciliar object
Between front and back doors
Iris sides?
1-front face : mesenchima originated
2- back face : contains much pigmented cell
3- stroma
Lens parts ?
A-lens capsule (rich by collagen type 4)
B-lens epithel( subcapsular epithel)
C-lens fibrils (contains kristallin , flensin)
Acodomation ?
To see near, ciliar muscles strain
Corpus vitroum (vitrous object) ?
Behind of lens
Contains collagen and hyaluronic acid
Tunica nervosa?
Retina
Retina parts?
1- external non-sensorial: single layered , melanin granulled
2- Internal sensorial retina
Retina structunes?
1- central fovea : where light concantrades
2- macula lutea: yellow frame that surrounds fovea
External non-sensorial retina?
Sits on brush membran
Contains much mithocondria
Wraps external part of photoreceptors
Stores vit a
Sensorial retina?
1- photoreceptor neurons: cone & rode
2- transmitting neurons: bipolar & ganglion
3-related neurons: horizontal & amacrin
4- neuroglia : müller
Layers of sensorial retina ?
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
Rod external section?
600-1000 disc
Discs contains rodopsin
High sensitivity for light
Cone external section?
Contains iodopsin
Low sensitibility for light
Rod internal segment?
A- elypsoid part : acidophylic , many mithocondria
B- myoid part: basophylic ,rapid protein synthesis , much glycogene less mithocondria
Cone internal section
A- more mc then rod
B- myoid : same with rod
External nuclear layer contains?
Rod & cone cell bodies and cores
External plexiform layer contains ?
Synapses with horizontal and bipolars
Internal nuclear layer contains?
Bipolar, horizontal, amacrin , müller
Internal plexiform contains?
Bipolar - ganglion synapse
where is Bipolar cells ?
Between inner and outer plexiform layer
Where is ganglion cell?
Ganglion cell layer
Horizontal cell ?
In inner nuclear layer
h1-rod h2cone
Amacrin cells
No axon
Notched nucleus
In inner nuclear layer
Modifies bipolar cell impulses
Neuroglial character cells?
1- müller
2- astrocyte
3- perivascular glia cell
4- retikulo endotelial microglial cell
Eye lid faces ?
Inner: covered with palpebral conjunctiva
Contains cellula calciformis between epithel cells
(Restricts vaporizing)
Outer : multilayered cheratinised epithel
