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83 Cards in this Set
- Front
- Back
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3 layers of the eye
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outer: cornea and sclera
middle: choroid, ciliary body, iris inner (retina): outer pigment epithelium and inner retina proper |
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Anterior 1/6 of the sclera is
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cornea
convex and transparent |
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Middle layer is vascular or avascular
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vascular
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anterior portion of the middle layer forms what
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iris and ciliary body w/ fiber system (zonula)
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lens are suspended by what
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zonula fibers
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anterior chamber are b/w what structure
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cornea and iris
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posterior chamber are b/w what structure
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iris, ciliary process and lens
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what is behind the lens
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vitrous space
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what is the fluid in the anterior and posterior chambers
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aqueous humor
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Where is the aqueous humor formed and drains through
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formed in posterior and drains thru angles in the anterior
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What is the vitrous space filled with
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gelatinous vitrous body
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Sclera consist of what type of CT
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dense, regular CT, collagen fivers from a continuous sheet
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what is the outer surface of the sclera
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episclera
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What outer layer envelops the sclera
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Tenon's capsule
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The loose collagen fibers of the episclera is connected to what
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Tenon's space
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What attachs te the sclera to the cornea
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limbus
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the sclera is hypovascular or herpervscular
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hypovascular
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The suprachoroidal lamina is rich in what and separates what two structures
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elastic fiber; sclera and choroid
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Sclera has what types of fibers
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collagen I
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what separates the eyeball from the orbit fat and sockey
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Tenon's capsule
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Cornea make what ratio of optical power
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2/3
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What part of the eye is the highest sensory innervated portion
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Cornea
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Where does the nutrition of the cornea come from
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aqueous humor and neighboring vessel
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Cornea vascular or avascular
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avascular
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EBSDEin
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five layers of Cornea
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What are the five layers of the Cornea
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Epithelium
Bowman's membrane Stroma Descemt's membrane Endothelium |
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What type of cell and how often do the regenerate in the Corneal epithelium
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non-keratinized stratified squamous
7 day |
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The Corneal epithelium is covered with what
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thin lipid and glycoprotein with microvilli
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Bowman membrane composed of
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collagen fibers and ground substance, acellular
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What layer is 90% of the cornea thickness
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stroma
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What is the Descemet Membrane and what is it composed of
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Basement membrane
acellular, fine collagen network |
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Type of cell of the endothelium
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simple squamous
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How does the endothelium maintain the stroma
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Na transport keep the stroma hydrated
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Descemet Membrane composed of
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basement membrane, acellular membrane w/ fine collagen network
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Is the limbus vascular or avascular
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vascular
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What attaches the sclera to the cornea
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limbus
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What provides the trabecular meshwork that merge to Schlemm's canal
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limbus
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What is the uveal tract
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choroid, iris and ciliary body
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Choroid avascular or vascular
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vascular
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What fibers and cell in the choroid
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collagen, elastic fibers
fibroblast, melanocytes, macrophages, lymphocytes and mast cell |
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the choroid is separated from the sclera by
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suprachoroidal lamina
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choroid is separated from the retina by
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Bruch membrane
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What do the melanocytes in the choroid function is what
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prevent the reflection of incident light
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What two anterior structure arise from the choroid
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ciliary body (focus)
Iris (aperture) |
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Ciliary Body composed of
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loose CT and elastic fibers
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What ring of fibers suspend the lens
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zonula fibers
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smooth muscle ring responsible for focus
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smooth muscle (ciliary muscle)
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What muscle has circular fibers that adjust the convexity of the lens thru zonula fibers
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ciliary muscle ring
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What happens when ciliary muscle contract
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release tension on lens the lens b/c spherical for near vision
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What happens when ciliary muscle relax
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zonular fibers are taut and flatten the lens for long range focus
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Ciliary body and processes are covered with what two layers of cell
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deep pigmented and superficial non-pigmented
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ridge like extension of ciliary body
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ciliary process
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what arises from ciliary process that suspend the lens
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zonula fibers (oxytalan)
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What secrete aqueous humor
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non-pigmented cell
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path of aqueous humor
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poster - anterior thru pupil - drain into trabecular meshwork angle - sclemm's canal - circulation
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what are the angle of aqueous humor filters
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45; narrow 25 degree
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Aperture that defines the amount of light to expose the retina
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Iris
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What is the extension of the choroid
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iris
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Anterior of the iris is composed of
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discontinuous layer of pigment cell and fibroblast
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What muscle are in the iris
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dilator and constrictor pupillae
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Pupillae muscle is innervated by sumpathetic or parasympathetic
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both
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Posterior surface of the iris is covered by
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two layer of retina
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posterior pigmented of the iris protects from what
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interior stray light
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Iris composed of
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vascular, fibroblast and pigmented cell
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Eye color determined by
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amount of pigment in stroma of iris
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three components of the lens
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capsule (collagen IV); subcapsular epithelium (simple cuboidal); lens fibers (lost organell filled with crystallin
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what cell lost nuclei and organelle to become elongated transparent structure
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lens fibers
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lens capsule derived from
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subcapsular epithelium, contains collagen IV and laminin
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Vitrous body is found where and consist of what
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behind the lens; 99% water and hyaluronic acid
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Hyaloid canal regress when
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10th week of development
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clear central zone in the vitrous body is called and left by what
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hyaloid canal, from the hyaloid artery
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posterior portion of retina function
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photosensitive
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What cells are sensitive to light
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rod and cone
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Ora serrata
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anterior portion of retina; two layer an continue to line the ciliary body
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path of light on the retina
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rods and cone -> bipolar cell -> ganglion cell and amacrine -> optic nerve -> brain
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how many dendrite do rods and cones have
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one
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dendrite of rod and cone have what
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photosensitive pigment
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Glial cell attached to the cells of the retina
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muller cell
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rod see in higher light or low light
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low light
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Are rods thin and long
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yes
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Cytoplasm contain what that is bleached by light
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Rhodopsin (visual purple)
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Cones contain what chemical and what colors is it sensitive to
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iodopsin; red, green, blue
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Are cones sensitive to high light or low
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high intensity light
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