Flashcards in Exam 1 Remington- Uvea Deck (103)
What is the extent of the iris?
Iris root (junction of iris with choroid) and pupillary ruff (circle around the pupil)
The ruff is ______ to the root
What are the two anatomical portions of the iris separated by the collarette?
Pupillary and ciliary
What is the collarette?
Attachment site for embryologic membrane
Pupillary portion of the iris
Portion surrounding the pupil
Ciliary portion of the iris
From collarette to the root
What is the composition of the anterior border layer of the iris?
CT, Fibroblasts and melanocytes
Iris processes extend into ____ ____ in the periphery
What is the composition of the iris stroma?
Loose CT, collagen fibers arranged in trabeculae, melanocytes, clump cells, non-pigmented fibroblasts
What are clump cells likely?
What are structures located in the iris stroma?
Blood vessels and sphincter muscle
Stomal ____ bundles encircle walls of arterioles and venules
What is the origin of iris arteries?
Major circle of the iris
What is the minor circle of the iris?
Incomplete circular vessel within iris stroma
The minor circle of the iris is a remnant of _______ development
What is the composition of the sphincter muscle?
Circular muscle, encircles the pupil
What is the action of the sphincter muscle?
Contracts to get miosis
What is the myoepithelium?
Anterior iris epithelium
What is the basal portion of the anterior iris epithelium?
Where is the dilator muscle located?
From root to midpoint below sphincter
What is the action of the dilator muscle?
Mydriasis, radially oriented
What is the origin of the dilator muscle?
What type of cells are in the posterior iris epithelium?
Cells of the posterior iris epithelium are joined by what?
How are the 2 layers of the epithelium positioned?
How are the 2 layers of the epithelium joined?
To each other via desmosomes
Innervation of the iris sphincter
Innervation of the iris dilator
What are crypts in the anterior iris surface?
Openings in the anterior border layer