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Ocular Anatomy Ch 3: Uvea
Middle, Vascular Layer
56
Anatomy
Graduate
09/25/2011

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Cards

Term
What constitutes the uvea?
Definition

Iris

Ciliary Body

Choroid

Term
Anterior Chamber
Definition
Cornea to Iris/Anterior Lens
Term
Posterior Chamber
Definition
Posterior Iris to Equatorial Lens
Term
Vitreous Chamber
Definition
Lens to Retina
Term
Anterior Segment
Definition

Cornea to Equatorial Lens. 

Inclusive of both Anterior and Posterior chambers.

Term
Posterior Segment
Definition
Inclusive of the Vitreous Chamber.
Term
Four layers of the Iris
Definition

1. Anterior Border Layer

2. Iris Stroma

3. Anterior Iris Epithelium

4. Posterior Iris Epithelium

Term
Anterior Border Layer
Definition
Meshwork of fibroblasts, melanocytes, and collagen fibrils.
Term
Fuch's Crypts
Definition
Openings in the meshwork of the iris.
Term
Connective Tissue Stroma
Definition

Pigmented and non-pigmented cells

Collagen fibrils

Ground substance

Term
Major Arterial Circle
Definition
In the ciliary body near the root, usually proceed radially from root to the pupillary margin.
Term
Minor Arterial Circle
Definition
Incomplete circular vessel in the iris stroma inferior to collarette. Capillaries form part of blood-aqueous barrier. 
Term
Sphincter Muscle
Definition
Circular structure of smooth-muscle joined by tight junctions.
Term
Miosis
Definition

Action of making pupil smaller.

Contraction of the sphincter muscle. 

Relaxed dilator muscle.

"Miotic Pupil"

Term
Mydriasis
Definition

Action of pupil dilation.

Relaxation of sphincter muscle.

Contraction of dilator muscle.

"Mydriatic Pupil"

Term
Dilator Muscle
Definition

Fibers arranged radially. 

Contraction pulls iris toward the root.

Term
Anterior Epithelium
Definition

Myoepithelial derived from neural ectoderm

Pigmented

Basal portion composes the dilator muscle

Term
Posterior Epithelium
Definition

Heavily pigmented

Simple Columnar Epithelium

Term
[image]
Definition

A. Anterior Border Layer

B. Pigment Ruff (Pupillary Margin)

C. Sphincter Muscle

D. Arcades of Minor Arterial Circle

F. Dilator Muscle

G. Anterior Epithelium

H. Posterior Epithelium

Term
[image]
Definition

A. Pupillary Portion

B. Ciliary Portion

C. Fuch's Crypts

D. Pupillary Ruff

E. Major Arterial Circle

F. Minor Arterial Circle

G. Sphincter Muscle (Circular)

H. Dilator Muscle (Radial)

I. Radial (Longitudinal) Contraction Furrows

 

 

Term
Iris Color
Definition
Dependent on density of CT in anterior border layer & stroma and of the melanocytes and pigmentation within them.
Term
Pars Plicata
Definition

Ciliary Processes

Wider, anterior portion

Term
Pars Plana
Definition

Flat Body

Extends posteriorly from pars plicata

Term
Ora Serrata
Definition
Transition from ciliary body to choroid
Term
Dentate Processes
Definition
Forward pointing tooth-like processes of the Ora serrata
Term
Oral Bays
Definition
Rounded, Mouth-like openings
Term
Zonules
Definition

Fibrous attachments to lens

Tension on zonules varies with contraction state of the ciliary muscle.

Contraction of muscle = Decreased zonule tension

Relaxation of muscle = Increased zonule tension

Term
Layers of the Ciliary Body
Definition

[Outer - Inner]

1. Supraciliaris

2. Ciliary Muscle

3. Ciliary Stroma

4. Ciliary Epithelium

Term
Supraciliaris
Definition

Outermost layer of ciliary body

Loose CT in ribbonlike layers

Allows the ciliary body to slide against sclera without damaging the tissue

 

Term
Ciliary Muscle
Definition

Smooth Muscle fibers 

Arranged: radially, longitudinally, circularly

 

Term
Longitudal Fibers of Brucke
Definition

Adjacent to Supraciliaris

Parallel to sclera

Bundles resemble a narrow V (base at scleral spur, apex at choroid)

Term
Radial Fibers of the Ciliary Muscle
Definition

Inner to the fibers of Brucke

Wider, shorter 

Transition from logitudinal fibers to circular fibers

Term
Mullers Circular Bundles
Definition

Innermost region of Ciliary Muscle

Sphincter type of action

Near major arterial circle

 

Term
[image]
Definition

1. Longitudinal Fibers

2. Radial Fibers

3. Circular Fibers

D. Scleral Spur

Term
Ciliary Stroma
Definition

Loose CT

Between Ciliary Muscle and Epithelial Layers

Highly Vascular--contributes to ability to make aqueous

Forms core of ciliary processes

Term
Ciliary Epithelium
Definition

Outer-Pigmented Layer

Inner Non-pigmented Layer--responsible for secretion of aqueous humor components

Blood-Aqueous Barrier

Aqueous produced by active secretion and microfiltration (aka ultrafiltration)

 

Term
Production of Aqueous
Definition

Depends on Na+/K+ ATPase pump

Carbonic Anhydrase catalyzes the production of HCO3- 

Secretion can be slowed by inhibiting enzyme

Term
Outer Layer of Optic Cup
Definition

Gives rise to:

Anterior Iris Epi

Outer, pigmented ciliary epi

Retinal pigmented epi (RPE)

Term
Inner Layer of Optic Cup
Definition

Gives rise to:

Posterior Iris Epi

Inner, non-pigmented ciliary epi

Neural retina

Term
Choroid
Definition

Ora Serrata to Optic nerve

Sandwiched between reina and sclera

Provides nutrition to outer 1/2 of retina

Term
Layers of the Choroid
Definition

Outer --> Inner

1. Suprachoroidal Lamina ("Lamina Fusca")

2. Choroidal Stroma

3. Choriocapillaris

4. Bruch's Membrane ("Basal Lamina")

 

Term
Surachoroid Lamina
Definition

CT joining Sclera to Choroid

Pigmented

Suprachoroidal space carriees long posterior arteries and nerves to anterior of globe

Term
Choroidal Stroma
Definition

Pigmented, vascularized, loose CT

Vessels arise from short posterior ciliary arteries

Haller's & Sattler's Layers

 

Term
Choriocapillaris
Definition
Single layer of fenestrated, anastomosing blood capillaries in a
stroma of fine collagen and elastic fibres.

Sole blood supply to macular region of retina

 

Term
Bruch's Membrane
Definition
Innermost layer of choroid, fuses with retina
Term
Layers of Bruch's Membrane
Definition

Outer --> Inner

1. Basement membrane of choriocapillaris

2. Outer collagenous zone

3. Elastic layer

4. Inner collagenous zone

5. Basement membrane of retinal pigment epithelium

Term
Blood Aqueous Barrier
Definition

Selective control of release into posterior chamber

Tight junctions usually prevent passage of large molecules

Non-fenestrated blood vessels of the iris and zonula occludnds junctions of the endothelial cells also contribute

Term
Short Ciliary Arteries
Definition

Enter globe around optic nerve

Branches form the choroidal circulation

Term
Long ciliary arteries
Definition

Travel through suprachoroidal space

Join anterior arteries to form Major Circle of iris

 

Term
Sensory Innervation
Definition

Nasociliary branch of Trigeminal Nerve (CN V)

Pain with movement of inflamed tissues

 

Term
Iritis
Definition
Inflamation of iris tissue
Term
Cyclitis
Definition
Inflamation of ciliary body
Term
Motor Innervation
Definition

Go to ciliary muscle and choroidal vessels

Sympathetic from cervical ganglion also go to iris dilator.

Parasympathetic from ciliary ganglion also go to iris sphincter.

Term
Effects of aging on the iris
Definition

Pigment Loss

Dilator atrophy

Sphincter muscle sclerosis: challenge to dilate

Term
Effects of aging on the ciliary body
Definition

CT increases

Accommodation decreases: Presbyopia

Term
Effects of aging on the choroid
Definition

Decrease in choroidal blood flow

Bruchs membrane:

Thickens

Deposition of basement membrane in collagenous zones

"Drusen" - Macular Degeneration precursor, yellow-white deposits in inner collagenous zone

Movement of nutrients and waste pdt is hampered

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