Lecture 8: 12/8

Question 1

the corrugated (rough surface) pattern of the basement membrane of the ciliary body pigmented epithelium is called

Answer 1

reticulum of Mueller

Question 2

what type of cells are found in the pigmented epithelium layer and how many layers of the cells are there?

Answer 2

it is a dark layer of cuboidal epithelium cells, single layer

Question 3

the pigmented cuboidal epithelium cells continue forward to become the

Answer 3

iris, anterior epithelium

Question 4

the pigmented cuboidal epithelium cells continue posterior to become the

Answer 4

RPE

Question 5

what is found in the apex of the pigmented cuboidal epithelium layer cells?

Answer 5

dark pigmented granules with melanin pigment (the apex pointing internally)

Question 6

explain how the white stripe appears on the pigmented epithelium layer?

Answer 6

at the top (the summit) of the ciliary processes there is less pigment

Question 7

what do you find at the lateral walls between pigmented epithelial cells?

Answer 7

a few interdigitations and some desmosomes

Question 8

which epithelium layer of the ciliary body has more organelles such as mitochondria and endoplasmic reticulum?

Answer 8

the nonpigmented epithelium

Question 9

is the pigmented or nonpigmented epithelium the most internal of the epithelial layers of the ciliary body?

Answer 9

the nonpigmented epithelium

Question 10

the nonpigmented epithelium continues anteriorly into the iris as

Answer 10

the posterior pigmented epithelium

Question 11

the nonpigmented epithelium continues posteriorly as the

Answer 11

nervous part of the retina

Question 12

the tight seals between the NPE with the desmosomes and interdigitations forms the:

Answer 12

blood-aqueous barrier

Question 13

in the NPE:

-the cells are _____ in the pars plicata and ______ in the pars plana

Answer 13

• cuboidal in pars plicana

- columnar in pars plana

Question 14

what are the 3 components of the aqueous humor?

Answer 14

• filtration
• ultrafiltration
• secretion

Question 15

where does filtration of aqueous humor occur?

Answer 15

it is coarse and occurs in capillaries in the ciliary processes

Question 16

where does ultrafiltration of aqueous humor occur?

Answer 16

finer process of fluid going in to epithelial cells

Question 17

describe secretion of aqueous humor

Answer 17

an active process using cell energy to pump fluid out of NPE into chamber

Question 18

what nervous control system causes the ciliary body to contract?

Answer 18

autonomic parasympathetic

Question 19

the iris is a continuation anteriorly of the

Answer 19

vascular tunic

Question 20

list 3 functions of the iris

Answer 20

1. diaphragm
2. amount of light- wide range illuminance
3. aberrations

Question 21

miosis is

Answer 21

to decrease the aperture, make the pupil smaller, increases depth of field/focus

Question 22

triad for focusing at near

Answer 22

1. convergence
2. accommodation
3. miosis

Question 23

mydriasis

Answer 23

decreased illuminance causes increased size of pupil

Question 24

the pharmaceutical drug used to dilate is called a

Answer 24

mydriatic drug

Question 25

embryology of pupil formation

Answer 25

there is a sheet of mesoderm that covers the eye and it atrophies away to form the pupil, atrophy varies from person to person

Question 26

crypts are

Answer 26

deep excavations that result from localized atrophy of the mesodermal layer

Question 27

which layer of the iris has the darker pigmentation?

Answer 27

the posterior layer

Question 28

the iris continues forward from the middle of the anterior face of the pars plicata. this is called the

Answer 28

root of the iris

Question 29

the root of the iris is the thinnest part and is ____mm thick

Answer 29

0.5mm

Question 30

average diameter of the iris is about

Answer 30

12mm

Question 31

the aqueous humor, which is constantly produced by the ciliary body in the _____ chamber must make its way through the pupil into the _____ chamber to a drainage system

Answer 31

posterior ->

anterior

Question 32

the pupil is eccentrically placed, meaning

Answer 32

the pupil is displaced towards the nasal side

Question 33

describe a good demonstration of how the margin of the iris is resting on the lens

Answer 33

after cataract surgery- someone with iridonesis has the iris waving around because it may not have the support of the lens anymore

Question 34

how can dilation cause aqueous flow problems?

Answer 34

it can stiffen the iris and out more pressure against the lens which can cause a flow of the fluid in the aqueous chamber

Question 35

the thinnest part of the iris (where trauma can rip it) is called the

Answer 35

root of the iris

Question 36

iridodyalis is

Answer 36

a tear of the root of the iris

Question 37

the peripheral edge of the iris is attached to the:

Answer 37

ciliary body

Question 38

is the central edge of the iris (pupillary margin) attached to anything?

Answer 38

no it is free and surrounds the aperture called the pupil