Layers and Regions of the Ciliary Body Flashcards
Most of the ciliary body begins __ of the limbus. A small portion of the longitudinal muscle fibers are __ the limbus.
Outside
Within
Anteriorly, the ciliary body is continuous with
The iris, uveal/trabecular meshwork, and scleral spur.
Posteriorly, the ciliary body is continuous with
The choroid and retina
Transition between the ciliary body and the retina/choroid is called the
Ora serrata
Does the ciliary body extend further temporally or nasally?
Temporally
What are the two regions of the ciliary body?
Pars plicata is the wider, anterior region.
-Contains the valleys of Kuhnt, with lesser processes that extend from these valleys.
Pars plana is the flatter, posterior region.
-Contains oral bays and teeth/dentate processes
5 layers inner to outer
Inner (closer to ciliary body) 1. Nonpigmented epithelium 2. Pigmented epithelium 3. Ciliary Stroma 4. Ciliary Muscle 5. Supraciliaris Outer
How many ciliary processes are located in the region of the pars plicata?
70-80 ciliary processes that extend into the posterior chamber.
What produces aqueous humor and where does it flow
The pars plicata region of the ciliary process. Flows into the posterior chamber between the lens and the iris, through the pupil and into the anterior chamber.
Valleys of Kuhnt are located where?
What creates the valleys?
What is within the valleys?
Located in the region of the pars plicata
- The valleys are created by the ciliary processes (shrimp)
- Within the valleys, there are smaller extensions called the lesser processes.
Where does the pars plana extend from and to
Extends from the posterior pars plicata to the ora serrata
What are the oral bays and teeth/dendate processes of the pars plana?
Oral bays- Project into the peripheral retina. Composed of ciliary stroma covered by pigmented and non=pigmented epithelium.
Teeth/dendate processes- located between oral bays. They are projections of peripheral retina.
Which is more inner? The non-pigmented epithelium or the epithelium?
The non pigmented epithelium.
It is the most inner layer that lines the posterior chamber and part of the vitreous chamber.
Zonules arise from the BM of which layer of cells
They arise from the BM of the non-pigmented epithelium. They insert into the lens capsule (which is the basement membrane of the lens) in the equatorial region of the lens. They suspend the lens in the posterior chamber.
What is the non-pigmented epithelium continuous with anteriorly and posteriorly?
Anteriorly, it is continuous with the posterior pigmented epithelium of the iris. Basement membranes are continuous with one another.
Posteriorly, it is continuous with the neurosensory retina. The basement membrane is continuous with the inner limiting membrane of the retina (from the muller cells)
The non-pigmented epithelium and the pigmented epithelium are base to base or apex to apex
Apex to apex
The non-pigmented epithelium is what cell type
Simple columnar
Pigmented epithelium is what cell type?
Simple cuboidal
Pigmented epithelium is continuous with what, anteriorly and posteriorly?
Anteriorly, continuous with the pigmented epithelium of the iris. Basement membranes are continuous with each other.
Posteriorly, it is continuous with the RPE. basement membranes are continuous with each other.
Ciliary stroma. What is it continuous with anteriorly and posteriorly?
Anteriorly, continuous with the iris stroma.
Posteriorly, continuous with the choroidal stroma.
The ciliary stroma is composed of what?
Vascularized, loose connective tissue (collagen, fibroblasts, and ground substance). melanocytes and WBC’s
The ciliary muscle is composed of which muscle fibers outer to inner?
Outer 1. Longitudinal 2. Radial 3. Circular Inner
Longitudinal muscle fibers of the ciliary muscle are connected to what structures anteriorly and posteriorly?
Anteriorly connected to the Trabecular/uveal meshwork and the scleral spur
Posteriorly, connected to the choroid in the form of stellate- shaped terminations called muscle stars
Ciliary muscles are surrounded by
Ciliary stroma. It continues into the muscle layers.
Supraciliaris is continuous with what?
Continuous with the suprachoroidal space
What is the purpose of the supraciliaris?
Allows passage arteries/veins/nerves.
Transversed by thin, pigmented bands of loose connective tissue, allowing the ciliary body to slide against the sclera without detaching or stretching the tissue.
