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