Uvea - ciliary body Flashcards
(17 cards)
when viewed from the front of the eye what shape si the ciliary body?
- ring shaped structure
What’s the width of the ciliary body?
- 5.9mm nasal
- 6.7mm temporal
How does the structure of the posterior and anterior ciliary differ?
- posterior ciliary, fairly flat
- anterior ciliary, numerous folds or processes that extend into the posterior chamber
Where is the apex of the ciliary body located?
- ora serrata
What are the two parts the ciliary body is divided into?
- pars plicata
- pars plana
What is the pars plicata?
- the wider naterior portion
- contains the ciliary processes
How many ciliary processes extend into the posterior chambers from the pars plicata?
- 70 to 80
What are the regions between the ciliary processes called?
- valleys of Kuhnt
What is the pars plana?
- ## flatter region of the ciliary body
Where does the pars plana extend from?
- posterior of the pars plicata to the ora serrata
What is the ora serrata?
- the transition between ciliary body and choroid
Where do zonule fibers course from?
- ciliary body to the lens
What is the outermost layer of the ciliary body?
- the supraciliaris
How is the supraciliaris arranged?
- loose connective tissue
- ribbonlike layers containing pigmented melanocytes, fibroblasts and collagen bands
what do the supraciliaris bands allow for?
- allows ciliary body to slide against the sclera without detaching from or stretching the tissue
What is ciliary muscle composed of?
- smooth muscle fibers oriented in longitudinal, radial and circular directions
How do the longitudinal muscle fibers lie?
- adjacent to the supraciliaris
- parallel to the sclera
