1 / 34

Eye

Eye. iris. pupil. ciliary body. Eyeball. FIBROUS. VASCULAR. NEURAL. Eyeball. Eyeball in LM. posterior segment. anterior segment. Eyeball. Three layers of the eye Multilayer inner retina Middle choroid – pigmented, vascular Outer sclera – dense fibrous c . t.

clover
Download Presentation

Eye

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Eye iris pupil ciliary body

  2. Eyeball FIBROUS VASCULAR NEURAL

  3. Eyeball

  4. Eyeball in LM posterior segment anterior segment

  5. Eyeball • Three layers of the eye • Multilayer inner retina • Middle choroid – pigmented, vascular • Outer sclera – dense fibrous c . t.

  6. Fibrous tunic - tunica externa oculi Cornea Sclera

  7. Cornea • Stratified squamous epithelium • Bowman´s membrane-anterior limiting lamina • Substantia propria cornae • 200 - 250 layers of regularly organized collagen fibrils • fibrocytes /keratocytes/ • Descemet´s membrane-posterior limiting lamina • the basement membrane of the posterior endothelium • Posterior endothelium • simple squamous epithelium

  8. Cornea

  9. Vascular tunic - tunica media oculi • Choroid - loose c.t. with network of blood vessels, numerous pigment cells • Ciliary body - loose c.t. with smooth muscle cells – musculus ciliaris /accomodation/ - ciliary processes – generate aqueous humor • Iris - central opening of the iris - the pupil ch c i

  10. Choroid • Lamina suprachoroidea /lamina fusca sclerae/ • Lamina vasculosa • Lamina chorocapillaris • Lamina vitrea /Bruch´s membrane/ sclera choroid retina

  11. Choroid

  12. Ciliary body - structure ciliary processes m. ciliaris ciliary epithelium - outer cell layer is pigmented, whereas the inner cell layer is nonpigmented /pars caeca retinae/

  13. Ciliary body Two functions • - accomodation • - production of the aqueous humor ACCOMODATION • from the ciliary processes extend fibers towards the lens - fibres are called zonular fibres • contraction of the m. ciliaris reduces the tension of the zonule fibres and result in a thickening of the lens which focusses on close objects - accomodation

  14. production of the aqueous humor

  15. Ciliary processes

  16. Iris • Anterior epithelium • discontinued layer • Anterior border layer • pigment cells • Stroma iridis • gelatinous c.t., numerous pigment cells • surrounds the pupil are smooth muscle cells which form the annular sphincter pupillae muscle • Posterior border layer • m. dilator pupillae /myoepithelial cells/ • Posterior epithelium • one layer pigmented cells • pars iridica retinae colour of the eyes

  17. Retina ora serrata

  18. Retina (neural tunic) – cell types • Pigment cells • Neurons • 1st neuron = rod cells and cone cells • 2nd neuron = bipolar cells • 3rd neuron = ganglion cells (multipolar) • interneurons • horizontal cells • amacrine cells • Neuroglia • Müller cells – occupy practicly the entire retina, part between outer and inner limiting membrane (which are formed by their cell bases)

  19. Sclera – Choroidea - Retina

  20. Retina inner limiting membrane 10 layers

  21. Retina light

  22. Retina - fovea centralis maximal visual acuity only cone cells

  23. Retina - discus nervi optici optic disc - blind spot sclera

  24. Retina

  25. Refractive media • Cornea • Aqueous humor • Lens • Vitreous body Refractive media are characterized by high transparency and refractivity.

  26. Lens biconvex body The lens fibers are highly specialized cells that differentiate from lens epithelium cells.

  27. Lens • lens capsule • is generated by the cells of the subcapsular epithelium • subcapsular epithelium • anterior and lateral parts→stayes • posterior part→lens fibers • lens fibres • very long (up to 12 mm), hexagonal cells, form the body of the lens • lens fibres are nucleated in the soft, outer cortex of the lens • lens fibres located deeper loose their nuclei and become part of the harder nucleus of the lens

  28. Fasciculus opticus – optic nerve • is surrounded by the three meninges • c.t. septa, which arise from the pia mater, separate the fibre bundles in the optic nerve • the axons in the optic nerve are supported by astrocytes and oligodendrocytes, microglia is also present

  29. Eyelid cutaneous part tarsal plate conjunctival part Meibomian glands – tarsal /sebaceae/ Zeiss glands /gl. sebaceae ciliares/ Moll glands /gl. sudoriferae ciliares – apocrine/

  30. Eyelid /palpebra oculi/ tarsal plate and tarsal Meibomian glands /sebaceae/

  31. Conjunctiva stratified columnar epithelium with goblet cells lamina propria mucosae

  32. Lacrimal apparatus • lacrimal gland • compound tubuloalveolar gland producing a lysosyme-rich serous fluid • lacrimal canaliculi • superior • inferior • lenghth: 8 mm, lined with s.s.epi • lacrimal sac • nasolacrimal duct • opens into the meatus inferior • lined with a pseudostratified ciliated epi

  33. Lacrimal gland

  34. Eye – list of slides • 88. Anterior eye segment • 89. Posterior eye segment • 90. Fasciculus opticus • 91. Palpebra • 92. Glandula lacrimalis

More Related