Lecture 7: 12/7

Question 1

list some functions of the ciliary body

Answer 1

accommodation, aqueous humor production, produces MPS

Question 2

example of a DPA drug that acts on the ciliary body

Answer 2

cycloplegic, which temporarily paralyzes ciliary body so you can get better refraction

Question 3

example of a TPA drug that acts on ciliary body

Answer 3

glaucoma drugs

Question 4

describe how the ciliary body can be an “asymmetric girdle”

Answer 4

one side is more narrow, it is not the same width all the way around, and it is a band that runs interior to the anterior portion of the eye

Question 5

ciliary body narrow portion (nasal side) width is

Answer 5

5.5mm

Question 6

ciliary body broader portion (temporal side) width is

Answer 6

6.5mm

Question 7

average width of ciliary body is

Answer 7

6.0mm

Question 8

anatomy of apex of ciliary body

Answer 8

points posteriorly and continuous with choroid

Question 9

anatomy of base of ciliary body

Answer 9

facing towards center of the cornea

Question 10

the base of the ciliary body’s outer end is attached to the:

Answer 10

scleral spur

Question 11

the base of the ciliary body’s inner end is where?

Answer 11

it jets out into the vitreous chamber (posterior of eye)

Question 12

anatomy of the external surface of the ciliary body

Answer 12

is against the sclera

the periciliary is continuous with the perichoroidal space

Question 13

anatomy of the internal surface of the ciliary body

Answer 13

meets up with the retina, and the retina “overlaps” the ciliary body like the wave on sand

Question 14

posterior view of the ciliary body has what 2 zones

Answer 14

1. pars plana (flat)

2. pars plicata (folded)

Question 15

what are the fine striations in the pars plana called?

Answer 15

stria cillaris of Schultz

Question 16

what width does the pars plana take up from the average 6mm

Answer 16

4mm

Question 17

which is most posterior out of the two zones of the ciliary body?

Answer 17

pars plana

Question 18

what is the ora serrata

Answer 18

the junction where there are some parts of the retina and some parts of the ciliary body, scalloped edge

Question 19

the scalloped extension of the ciliary body in the ora serrata is called

Answer 19

the bays of ciliary body

Question 20

the tooth-like extensions of the retina at the ora serrata are called the

Answer 20

dentate processes (of the retina)

Question 21

the pars plicata makes up ____mm of the 6mm wide ciliary body

Answer 21

2mm

Question 22

the anterior end of the ciliary body on the pars plicate is continuous with the

Answer 22

iris (of the vascular tunic)

Question 23

how many folds are in the pars plicata and what do they look like?

Answer 23

they have a white stripe on top of the folds

70-80 folds

Question 24

the “folds” of the pars plicata (called the ciliary processes) is where the ____ attach

Answer 24

-zonules attach (zonules is where the aqueous humor is produced)

Question 25

it is from the surface of the ___ ____ that the aqueous humor is secreted

Answer 25

ciliary processes

Question 26

the outer edge of the surface of the pars plicata is attached to the:

Answer 26

scleral spur

Question 27

list of the 6 layers of the ciliary body

Answer 27

1. ciliary muscle 2. vessel layer (stroma) 3. basal lamina 4. pigment epithelium of ciliary body 5. non-pigmented epithelium of ciliary body 6. internal limiting membrane

Question 28

which ciliary body layer is a continuation of Bruch's?

Answer 28

basal lamina

Question 29

the ciliary muscle layer is what type?

Answer 29

smooth muscle

Question 30

the ciliary muscle layer is controlled by

Answer 30

the autonomic nervous system (ANS), the parasympathetic division

Question 31

what is the origin of the ciliary muscle layer?

Answer 31

the ciliary tendon (which is attached to the scleral spur)

Question 32

what is the bundle arrangement of the ciliary muscle layer from external to internal?

Answer 32

1. longitudinal muscle 2. radial muscle 3. circular muscle

Question 33

the origin of the longitudinal, radial, and circular muscle groups are the

Answer 33

ciliary tendon

Question 34

attachment of the muscle bundles in the ciliary muscle is in the form of a V shape. where does the apex and base face?

Answer 34

the base facing the scleral spur and the apex facing posteriorly

Question 35

which of the three muscle bundles in the ciliary muscle layer ends in muscle stars in the suprachoroid?

Answer 35

longitudinal

Question 36

what muscle bundle in the ciliary muscle layer is internal to the longitudinal and has the base of the V which is wider and tend to run at an oblique angle to the optic axis?

Answer 36

radial

Question 37

where is the insertion of the circular bundle of the ciliary muscle?

Answer 37

into the anterior ends of the ciliary processes

Question 38

the muscle bundle that has two arms of the V shaped bundle arising from very wide attachments to the ciliary tendon, and that run almost parallel to the equator

Answer 38

circular

Question 39

the 3 muscle groups in the ciliary muscle have what action when they contract?

Answer 39

causes the ciliary body to move forward and at the same time inward towards the center of the eye

Question 40

axipetal motion has what action on the zones and ciliary body?

Answer 40

it causes a reduction in tension on the zonules causing the elastic lens capsule to contract -> lens becomes more spherical

Question 41

increased dioptric power results from the ______ curvature of the lens surfaces

Answer 41

increased

Question 42

describe the main components of the vessel layer (stroma) of the ciliary body

Answer 42

arteries, capillaries, veins, in a loose connective network

Question 43

what are the two vessel that supply blood from the vessel layer of the ciliary body?

Answer 43

- long posterior ciliary artery | - anterior ciliary artery

Question 44

the two vessels, the long posterior ciliary artery and the anterior ciliary artery, form a plexus called

Answer 44

major arterial circle of the iris

Question 45

describe the path of a vessel from the major arterial circle

Answer 45

they run posteriorly and enter the ciliary processes and form unusually rich capillary beds in the ciliary processes

Question 46

where does venous drainage occur from the stroma?

Answer 46

from the stroma is posterior to the choroid

Question 47

the elastic layer of Bruch's membrane gradually tails off into fine fibrils which lose themselves in what layer in the basal lamina?

Answer 47

in the stroma of the vessel layer in the area of the pars plicata

Question 48

the inner collagenous zone of Bruch's thickens at the ora serrata and extends into the

Answer 48

basal lamina, pars plicana (similar to elastic layer)

Question 49

the basement membrane of the pigmented epithelium of the ciliary body is an anterior continuation of:

Answer 49

the basement membrane of the retinal pigment epithelium

Question 50

the basement membrane of the pigmented epithelium of the ciliary body continues on to the

Answer 50

root of the iris