[2] Lecture 20-the Eye Flashcards
(32 cards)
Cornea and sclera make up the:
Fibrous tunic
Choroid, ciliary body, and iris make up the
vascular tunic
Retina =
Inner tunic.
Outermost layer of eye.
Loosely arranged collagen and elastic fibers.
Highly vascular.
Attached the lining of the eyelid (conjunctiva) to the sclera
Episcleral layer
Made up interlacing collagen fiber.
Attachemnet site for tendons of extrinsic eye muscles.
Collagen bundles are always parallel to outer surface of sclera.
Sclera proper
Perforated disc of sclera.
Pass through for optic nerve fibers
**
Lamina cribrosa
Anteriorly the sclera is continuous w/ ______
Cornea
The junction between cornea and sclera is the :
Limbus
Is the limbus vascularized
Highly vascularized
Retina is really part of the:
Brain
Posteriorly the sclera is continuous w/ the dural covering of the _______________
Optic nerve
Layers of the cornea [5]
Corneal epithelium
Bowmans membrane
Corneal stroma
Descemet’s membrane
Corneal endothelium
Stratified nonkeratinized squamous epithelium. 5-6 layers
High mitiotic activity in basal layer.
Turnover-1 week
Corneal epithelium
Acellular layer separates epithelium from stroma.
Randomly arranged collagen fibers - even though acellular.
Bowmans membrane.
Thin layers of ordered arrays of collagen fibers in cornea
Corneal stroma
A cellular layer of collagen bundles
Separates stroma from endothelium
Descemets membrane
Single layer of large squamous cells in cornea
Corneal endothelium
Extends anterior to ora serrata of the retina.
Highly vascularized layer of loose CT-Forms choriocapilary network. Provides nutrient or outer layers of retina. Also melanocytes.
Bruch’s [glassy] membrane-acellular fused basal laminae
Choroid
Wedge-shaped expansion of choroid peripheral to the lens.
Covered by a double layer of cells:
Innermost is continuous w/ pigmented retinal layer.
Surface layer is sensory of retina.
Produces aqueous humor.
Suspensory ligaments extend to just behind lens equator and anchor the lens in place.
Ciliary muscles- accommodation. Innervated by parasympathetic.
Ciliary body
Aqueous humor initially flows into:
Posterior chamber
Ciliary muscles and accommodation
Nonpigmented surface layer of cells producing aqueous humor- basal infoldings,secrete aqueous humor into posterior chamber
Ciliary body.
Located anterior to the lens and separates the anterior and posterior chambers.
Angle- formed at lateral borders, loose CT, passageway for aqueous humor.
Creates opening= pupil.
Double layer of epithelium
Melanocytes present.
Iris
2 subdivisions divided by the ora serrata.
Optic disc.
Fovea centralis.
Contains rods/cone.
Retina.
Region on posterior eye where optic nerve exits.
Blind spot.
Has no photosensitive retina
Optic disc.
