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Ocular Anatomy
Conj - Retina
43
Anatomy
Professional
01/10/2012

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Cards

Term
What are conjuctival cysts filled with
Definition
mucoid material
Term
What are conjuctival concretions and who is likely to get them
Definition
- small yellow white nodules the size of a pinhead located in tarsal conj
-elderly get them, can get them removed if giving foreign body sensation
Term
Conjuctival lymph vessels are located within the submucosa and drain into the lymphatics of the eyelids. Where do the lateral aspects drain? The medial aspects?
Definition
Lateral -- Parotid
Medial -- submandicular (m's go together)
Term
What is the term for edema of the conjuctiva
Definition
Chemosis
Term
Pinguecula is modified conjuctiva in intrapalpebral areas from what sublayer
Definition
Submucosa.
1. Hyalinization 2. abnormal elastic fibers
Term
Pterygium is a fibrovascular overgrowth of what kind of conjuctiva
Definition
Bulbar. It is surgically removed when 1. apex approaches visual axis
2. signficant corneal astigmatism is induced
3. cosmesi
Term
Where are the stem cells located for the palpebral con? The bulbar conj?
Definition
Palpebral -- mucocutaneous junction
Bulbar -- Limbus
Term
What vitamin can help to increase number of goblet cells
Definition
Vitamin A
Term
What layer of the conjuctiva are the immune cells located?
Definition
Submucosa
Term
What structure suspends the lens from the CB
Definition
Zonular Fibers
Term
How is the posterior lens attached the anterior vitreous
Definition
Hyaloid capsular ligament = gives circular ring adhesion
Term
Is the anterior or posterior surface of the lens steeper
Definition
Posterior
Term
What is the refractive power of the lens
Definition
20D
Term
Why is there not a posterior epithelium on the lens
Definition
Posterior cells become primary lens fib ers and eventually the embryonic nucleus
Term
Where does the cell mitosis occur in the lens
Definition
Germinal zone
Term
Where can the newest lens fibers be found? Deep or superficial?
Definition
Superficial. Deepest = oldest
Term
Where is the highest concentration of crystallins found in the lens
Definition
Nucleus
Term
What is the number one risk factor for cataract formation
Definition
age
Term
Why is the sclera opaque
Definition
The random and interwoven pattern of collagen bundles are irregular and induce light scatter
Term
How many mm is Tenon's Capsule posterior the limbus?
Definition
2 mm
Term
What is the thinnest area of sclera? The weakest? The thickest?
Definition
Thinnest = 0.30mm under recti tendons
Weakest = Lamina Cribosa
Thickest = 1.0 mm Posterior Pole
Term
What three structures make up the uveal tract?
Definition
Iris, Ciliary Body, Choroid
Term
Where does the blue eye color come from?
Definition
The wavelength results from light scatter caused by arrangement and density of CT components (less pigment in anterior border layer)
Term
What could a congenital heterochromia be due to?
Definition
Disruption of sympathetic innervation. Remember Horner's syndrome is associated with heterochromia
Term
Where is the Major Circle of the Iris located?
Definition
CB close to iris root
Term
Is the sphincter muscle located in the CB or the Iris? Is it sympathetic or parasympatetically inntervated?
Definition
Located in Iris STROMA
Innervated by SPCN = parasympathetic --> P.S. Parasympathetic. Stroma. SPCN.
Term
Where is the dilator muscle located? Is it parasympathetic or sympathetic?
Definition
Dilator is behind the sphincter muscle, terminates @ midpoint of sphincter.
Innervation: Sympathetic --
Term
What is the ora serrata the transition between?
Definition
CB and Choroid
Term
What muscle has dual innervation from both the parasympathetic and sympathetic systems? What is this muscle used for?
Definition
Ciliary muscle
Parasympathetic causes contraction and sympathetic is inhibitory
Accommodation
Term
The major arterial circle of the iris is from anastomosis of what two arteries?
Definition
LPCA & ACA (this makes sense, @ the front of the eye = anterior, and the arteries that come from behind have to be long)

Remember the aqueous humor also comes from the bloodstream via the fenestrated capillaries of the Major Arterial Circle of the Iris
Term
What layer of the ciliary body is involved in active secretion of the aqueous the serves as a diffusion barrier between the blood and the aqueous?
Definition
Non pigmented ciliary epithelium
Term
The choroidal stroma contains both Haller's layer and Sattler's layer, which layer has larger vessels?
Definition
Haller's layer --> You gotta "haller" before you "S(e)attle"
Term
Choroidal melanoma is the most common primary intraocular tumor in adults. What layer of the choroid has high melanin and vascularization that provides a prime spot
Definition
Choroidal Stroma
Term
Is the Hyaluronic Acid most concentrated in the periphery or in the center of the vitreous
Definition
Periphery/outside
Term
What layer is just interior to the vitreous cortex
Definition
Intermediate zone. Fibers on periphery are parallel to the cortex and central fibers are parallel to cloquet's canal
Term
Where does Cloquet's canal terminate?
Definition
Area of Martegiani = funnel @ ONH
Term
What is the significance of lipofuscin in the RPE
Definition
they contain degraded products of phagocytosis.
Term
What structure connects the inner and outer segments of photoreceptors? How are the outer segments oriented?
Definition
Cilium
Tip is oriented toward RPE and base toward inner segment
Term
What two cells do PR synapse with
Definition
Bipolar and Horizontal cells
Term
Where is the outer nuclear layer thickest
Definition
Fovea
Term
Where is the deep capillary network located? The superficial network?
Definition
Deep = INL
Superficial = NFL
Term
Which bundle in the NFL determines VA
Definition
papillomacular bundle
Term
Which layer of the retina is responsible for retinal sheen
Definition
ILM
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