Ciliary Body: Anatomy
teeth/dentate processes
elongations of retinal tissue between oral pays
anteriorly, the ciliary stroma is continuous with the...
iris stroma
the nonpigmented epithelium lines the _____ and _____ so that it can actively secrete _____
posterior chamber; part of vitreous chamber; aqueous humor into the posterior chamber
Anteriorly the nonpigmented epithelium is continuous with the
posterior pigmented epithelium of the iris; basement membranes are continuous with one another
Where does most of the ciliary body begin?
posterior to the limbus (some of the longitudinal muscle fibers are anterior to the limbus)
supraciliaris
potential space with loose connective tissue and melanocytes
oral bays
rounded portion of ciliary body
in the uveoscleral pathway, aqueous humor drains into the ____
supraciliaris
the circular muscle fibers of the ciliary muscle are located in...
the anterior, inner region of the ciliary body; fibers course parallel to the limbus
anteriorly, the longitudinal muscle fibers of the ciliary muscle attach to the...
scleral spur and uveal meshwork
The pars plana has a ___pattern
serrated
pigmented epithelium: cell type, joined by.., shape
single layer of epithelial cells joined by desmosomes, gap junctions, tight junctions, cuboidal shape
Nonpigmented epithelium cell type/what is it joined by/shape?
single layer of epithelial cells; desmosomes, gap junctions, tight junctions; columnar shape
ciliary muscle is composed of
smooth muscle fibers with longitudinal, radial, and circular orientations
what is the purpose of the loose layers of collagen in the supraciliaris?
allow the ciliary body to slide against the sclera without detaching or stretching the tissue
the nonpigmented epithelium is ____ to ____ with the pigmented epithelium and is joined by ____
apex to apex; gap junctions
nonpigmented epithelium actively secretes ________ into the posterior chamber
aqueous humor
What is the purpose of tight junctions in the nonpigmented epithelium?
blood-aqueous-barrier; forces all molecules to pass through the epithelial cells' membrane
the ciliary muscle fibers are arranged in _____ that are interwoven and the fibers are surrounded by _____
bundles; stroma (which continues into the muscle layer)
posteriorly, the longitudinal muscle fibers of the ciliary muscle attach to the...
choroid in the form of stellate-shaped terminations (muscle stars)
posteriorly, the ciliary stroma is continuous with the
choroidal stroma
The major arterial circle of the iris (MACI) is present in the....
ciliary stroma
How many ciliary processes are located in the pars plicata?
70-80; projections of the stroma covered by epithelium which extend into the posterior chamber; produce aqueous humor; regions b/w processes are called valleys of Kuhnt (lesser processes extend from the valleys)
shape of pigmented vs nonpigmented cells
cuboidal vs columnar
Aqueous humor passes from the stroma to the pigmented epithelium via....
diffusion
Water and electrolytes of the MACI diffuse from the ____ into the stroma
fenestrated capillaries
Pars plana (orbicularis ciliaris)
flatter region of ciliary body; extend from the posterior pars plicata to the ora serrata
Aqueous humor passes from the pigmented epithelium to the nonpigmented epithelium via...
gap junctions
aqueous humor travels from pigmented to nonpigmented through _______
gap junctions
Ciliary body
heavily pigmented ring-shaped structure surrounding the lens
Anteriorly, the ciliary body is continuous with...
iris, uveal meshwork, and scleral spur
the ciliary stroma is composed of...
loose connective tissue (collagen, fibroblasts, ground substance) with melanocytes and WBCs
posteriorly, the nonpigmented epithelium is continuous with...
neurosensory retina; basement membrane is continuous with the inner limiting membrane of the retina
What are the 5 layers of the ciliary body from inner to outer?
nonpigmented epithelium, pigmented epithelium, stroma, muscle, supraciliaris (NEver PEe Singing Many Songs)
supraciliaris the the ____ layer of the ciliary body and is adjacent to the _____
outermost; sclera
the longitudinal muscle fibers of the ciliary muscle are ____ to the sclera
parallel
zonules arise from the ____ and the ___
pars plana and valleys of kuhnt in the pars plicata
what are the regions of the ciliary body? (anterior to posterior)
pars plicata (corona ciliaris) and pars plana (orbicularis ciliaris)
the anterior pigmented epithelium is continuous with...
pigmented epithelium of the iris; basement membranes are continuous with one another
the posterior pigmented epithelium is continous with
pigmented epithelium of the reina (RPE); basement membranes are continuous with one another
outer to the nonpigmented epithelium is the...
pigmented epithelium; aqueous humor travels from pigmented to nonpigmented through gap junctions
posteriorly, the ciliary body is continuous with...
the choroid and retina (transition between the ciliary body and retina/choroid is called the ora serrata
What is the ciliary body part of?
the uvea (highly vascularized)
Ora serrata
transition area where ciliary body and retina meet (termination of retina and beginning of ciliary body)
radial muscle fibers of the ciliary muscle are considered to be the _____ from the the longitudinal muscle fibers to the circular fibers
transition layer
pars plicata (corona ciliaris)
wider anterior portion of ciliary body