Ciliary body Flashcards
APex of ciliary body terminates at the __________.
Ora serrata
Base of the ciliary body, one tip terminates at the ________. The middle of the base joins the root of the iris. The other tip of the base borders the posterior chamber.
Scleral spur
A ring like structure just behind the iris and surrounding the crystalline lens of the eye.
Ciliary body
Ciliary body is divided into 2 parts or regions…
Pars plicata
Pars plana
The wider, anterior portion containing the ciliary process.
Pars plicata
There are approx 70 to 80 __________that extend into the posterior chamber, and the regions between them are called ____________. (know it)
ciliary processes
Valleys of kuhnt
A ciliary process measures approximately ____ in length, ___ in width, and ___ in height.
2 mm length
0.5 mm width
1 mm in height
One leg of the triangle borders the ______.
sclera
One leg of the triangle borders the ___________.
posterior chamber
The _______ is the flatter region of the ciliary body.
pars plana
The ora serrata has a serrated pattern, the forward-pointing apices of which are called teeth or ____________. The rounded portions that lie between the teeth are called _________.
Dentate processes
Oral bays
_________ attach between ciliary body and lens. Assist in manipulating lens for accommodation.
Zonule fibers
What are the layers of the ciliary body? (from superficial to deep)
Supraciliaris
Ciliary muscle
Ciliary stroma
Ciliary Epithelium
The outermost layer of the ciliary body adjacent to sclera. What kind of tissue and what does it contain?
Supraciliaris
Loose connective tissue
Melanocytes, fibroblasts, and collagen bands
Has capacity to accumulate fluid
This is composed of 3 smooth muscle fibers oriented in different directions.
Ciliary muscle- (each muscle fiber resembles a long narrow V)
Longitudinal muscle fibers- (lies adjacent to supraciliaris and parallel to sclera.
Radial muscle fibers- (originate at scleral spur insert into connective tissue near base of ciliary process)
Circular- (innermost region of ciliary muscle, sphincter type action. located at base of iris.)
3 types of ciliary muscle fibers…
Longitudinal
Radial
Circular
What is main system that innervates the ciliary body?
Parasympathetic stimulation= activates the muscle for contraction, sympathetic innervation likely has an inhibitory effect
What is a highly vascularized, loose connective tissue that lies between the ciliary muscle and the epithelial layers. Forms the core of each of the ciliary processes.
Stroma of the ciliary body (loose connective tissue ‘filler’)
The major arterial circle of the iris is located in the ciliary stroma ________ to the circular muscle near the _________.
Anterior
Iris root
Epithelium has 2 layers, how are they positioned?
Connected apex to apex, via gap junctions between the apical surfaces provide a means of cellular communication between the layers and are important in formation of aqueous.
What is the ciliary body epithelium apex to apex orientation?
single layered optic vesicle
Optic cup invagination
Dual layered cup
Outer layer of epithelium of ciliary body is composed of what type of cells?
Pigmented and cuboidal, and the cells are joined by desmosomes and gap junctions
Anteriorly the epithelium is continuous with ______, and posterior it is continuous with the _______.
Anterior iris epithelium
Posterior retinal pigment epithelium (RPE)
A ______________ attaches the pigment epithelium to the stroma.
Basement membrane
Which of two layers produce aqueous? Also secretion
Non-pigmented
Inner epithelial layer is _____________ and composed of columnar cells in the pars plana and cuboidal cells in the pars plicata
non-pigmented
What do the ridges of connected to basement membrane function as?
Increasing surface area for more production and secretion
The ciliary body does what 2 things????
Produces and secretes AQUEOUS humor
Musculature causes ACCOMMODATION and can affect aqueous outflow.
