Lecture 8: 12/8 Flashcards
the corrugated (rough surface) pattern of the basement membrane of the ciliary body pigmented epithelium is called
reticulum of Mueller
what type of cells are found in the pigmented epithelium layer and how many layers of the cells are there?
it is a dark layer of cuboidal epithelium cells, single layer
the pigmented cuboidal epithelium cells continue forward to become the
iris, anterior epithelium
the pigmented cuboidal epithelium cells continue posterior to become the
RPE
what is found in the apex of the pigmented cuboidal epithelium layer cells?
dark pigmented granules with melanin pigment (the apex pointing internally)
explain how the white stripe appears on the pigmented epithelium layer?
at the top (the summit) of the ciliary processes there is less pigment
what do you find at the lateral walls between pigmented epithelial cells?
a few interdigitations and some desmosomes
which epithelium layer of the ciliary body has more organelles such as mitochondria and endoplasmic reticulum?
the nonpigmented epithelium
is the pigmented or nonpigmented epithelium the most internal of the epithelial layers of the ciliary body?
the nonpigmented epithelium
the nonpigmented epithelium continues anteriorly into the iris as
the posterior pigmented epithelium
the nonpigmented epithelium continues posteriorly as the
nervous part of the retina
the tight seals between the NPE with the desmosomes and interdigitations forms the:
blood-aqueous barrier
in the NPE:
-the cells are _____ in the pars plicata and ______ in the pars plana
- cuboidal in pars plicana
- columnar in pars plana
what are the 3 components of the aqueous humor?
- filtration
- ultrafiltration
- secretion
where does filtration of aqueous humor occur?
it is coarse and occurs in capillaries in the ciliary processes
where does ultrafiltration of aqueous humor occur?
finer process of fluid going in to epithelial cells
describe secretion of aqueous humor
an active process using cell energy to pump fluid out of NPE into chamber
what nervous control system causes the ciliary body to contract?
autonomic parasympathetic
the iris is a continuation anteriorly of the
vascular tunic
list 3 functions of the iris
- diaphragm
- amount of light- wide range illuminance
- aberrations
miosis is
to decrease the aperture, make the pupil smaller, increases depth of field/focus
triad for focusing at near
- convergence
- accommodation
- miosis
mydriasis
decreased illuminance causes increased size of pupil
the pharmaceutical drug used to dilate is called a
mydriatic drug