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Ocular Anatomy > Lecture 7: 12/7 > Flashcards

Lecture 7: 12/7 Flashcards

1
Q

list some functions of the ciliary body

A

accommodation, aqueous humor production, produces MPS

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2
Q

example of a DPA drug that acts on the ciliary body

A

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

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3
Q

example of a TPA drug that acts on ciliary body

A

glaucoma drugs

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4
Q

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

A

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

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5
Q

ciliary body narrow portion (nasal side) width is

A

5.5mm

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6
Q

ciliary body broader portion (temporal side) width is

A

6.5mm

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7
Q

average width of ciliary body is

A

6.0mm

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8
Q

anatomy of apex of ciliary body

A

points posteriorly and continuous with choroid

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9
Q

anatomy of base of ciliary body

A

facing towards center of the cornea

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10
Q

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

A

scleral spur

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11
Q

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

A

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

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12
Q

anatomy of the external surface of the ciliary body

A

is against the sclera

the periciliary is continuous with the perichoroidal space

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13
Q

anatomy of the internal surface of the ciliary body

A

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

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14
Q

posterior view of the ciliary body has what 2 zones

A
  1. pars plana (flat)

2. pars plicata (folded)

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15
Q

what are the fine striations in the pars plana called?

A

stria cillaris of Schultz

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16
Q

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

A

4mm

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17
Q

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

A

pars plana

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18
Q

what is the ora serrata

A

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

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19
Q

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

A

the bays of ciliary body

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20
Q

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

A

dentate processes (of the retina)

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21
Q

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

A

2mm

22
Q

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

A

iris (of the vascular tunic)

23
Q

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

A

they have a white stripe on top of the folds

70-80 folds

24
Q

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

A

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

25
Q

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

A

ciliary processes

26
Q

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

A

scleral spur

27
Q

list of the 6 layers of the ciliary body

A
  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
28
Q

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

A

basal lamina

29
Q

the ciliary muscle layer is what type?

A

smooth muscle

30
Q

the ciliary muscle layer is controlled by

A

the autonomic nervous system (ANS), the parasympathetic division

31
Q

what is the origin of the ciliary muscle layer?

A

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

32
Q

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

A
  1. longitudinal muscle
  2. radial muscle
  3. circular muscle
33
Q

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

A

ciliary tendon

34
Q

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

A

the base facing the scleral spur and the apex facing posteriorly

35
Q

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

A

longitudinal

36
Q

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?

A

radial

37
Q

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

A

into the anterior ends of the ciliary processes

38
Q

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

A

circular

39
Q

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

A

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

40
Q

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

A

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

41
Q

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

A

increased

42
Q

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

A

arteries, capillaries, veins, in a loose connective network

43
Q

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

A
  • long posterior ciliary artery

- anterior ciliary artery

44
Q

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

A

major arterial circle of the iris

45
Q

describe the path of a vessel from the major arterial circle

A

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

46
Q

where does venous drainage occur from the stroma?

A

from the stroma is posterior to the choroid

47
Q

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

A

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

48
Q

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

A

basal lamina, pars plicana (similar to elastic layer)

49
Q

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

A

the basement membrane of the retinal pigment epithelium

50
Q

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

A

root of the iris

Ocular Anatomy (20 decks)

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