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Ocular Anatomy > Lecture 1/18 > Flashcards

Lecture 1/18 Flashcards

1
Q

what kind of suture is in embryologic nucleus of the lens?

A

Y suture

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2
Q

how is the Y suture different on the anterior vs. posterior surface

A

anterior surface: Y is erect

posterior surface: Y is inverted

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3
Q

in what way do the lenticular fibers in the adult nucleus come together?

A

in a star pattern (stellate suture)

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4
Q

what does the zonules attach?

A

the zonules attach the surface of the ciliary body to the capsule of the lens

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5
Q

what are the zonular fibers made up of?

A

non-collagenous and made of a protein with significant components of glycoprotein

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6
Q

what is the canal of petit?

A

a potential space between the posterior zonular surface and anterior vitreous

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7
Q

what is the canal of hannover?

A

potential space in between the zonules

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8
Q

where do the zonules attach on the ciliary body?

A

most attach to pars plicata (and a few attach to pars plana)

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9
Q

where do the zonules attach on the lens

A

1.5 mm anterior to equator
1.0 mm posterior to equator
(and a few attach right at equator)

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10
Q

where do principal zonular fibers attach?

A

from ciliary body to capsule of lens

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11
Q

what are the principal zonular fibers involved with?

A

in accommodation when C.B. is relaxed and principal fibers pull on lens to flatten them out

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12
Q

tension of zonules does what to the lens

A

puts it in the unaccommodated state

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13
Q

what are the 2 groups of principal fibers?

A
  • orbiculocapsular

- ciliocapsular

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14
Q

where are the orbiculocapsular principal fibers located?

A

going from posterior portion of CB (pars plana) to both anterior and posterior to the euator of the lens

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15
Q

where are the ciliocapsular principal fibers located?

A

from valleys/ridges on ciliary processes to posterior equator and at the equator

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16
Q

what is the purpose of association (or auxiliary) zonular fibers?

A

structural

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17
Q

list 3 types of association zonular fibers

A
  1. orbiculociliary
  2. interciliary
  3. circular
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18
Q

orbiculociliary association zonular fibers run from:

A

from pars plana to pars plicata

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19
Q

interciliary association zonular fibers run from:

A

from one ciliary process to another

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20
Q

circular association zonular fibers run from:

A

zonule to zonule in circular pattern (looks like spider web)

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21
Q

the anterior border of the anterior chamber =

A

posterior cornea

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22
Q

posterior boundary of anterior chamber =

A

anterior iris and anterior surface of lens in pupil

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23
Q

anterior chamber depth is about:

A

3.5 mm (average)

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24
Q

anterior chamber depth in myopes vs. hyperopes

A

myopes: deeper anterior chamber (longer eyes)
hyperopes: have shallower anterior chamber (shorter eye)

25
Q

anterior chamber depth changes with age

A

as you age, anterior chamber depth gets shallower

26
Q

where is the filtration angle located?

A

at the junction of the ciliary root of the iris and the sclera

27
Q

the filtration angle is located about ____ from the limbus

A

1.5 mm posterior to the limbus

28
Q

what is in the filtration angle?

A

trabecular meshwork

29
Q

filration angle varies from ___ to ____ degrees

A

20 to 45 degrees

30
Q

20 degree filtration angle is a ____ chamber than 45 degree

A

20 for more shallow chamber

31
Q

the triangular trabecular meshwork’s apex faces:

A

apex pointed towards cornea

32
Q

the triangular trabecular meshwork’s base faces:

A

base against scleral spur and anterior surface of CB

33
Q

list 3 components of the trabecular meshwork:

A
  1. uveal meshwork
  2. corneoscleral meshwork
  3. juxtacanicular tissue
34
Q

what component of the trabecular meshwork is most internal?

A

uveal meshwork

35
Q

what component of the trabecular meshwork has the largest openings and the smallest fibers

A

uveal meshwork

36
Q

where does the uveal meshwork run?

A

runs from the end of Descemet’s down to the CB

37
Q

composition of the uveal meshwork is:

A

fibers have collagen core and are covered with endothelium

38
Q

composition of corneaoscleral meshwork

A

composed of concentric sheets that have the holes punched in them (called trabecular sheets)

39
Q

what is the largest component of the trabecular meshwork?

A

corneoscleral meshwork

40
Q

a function of corneoscleral meshwork

A

has smaller holes and openings for the aqueous to pass through

41
Q

what is the thin layer between the canal of SChlemm and corneoscleral meshwork?

A

juxtacanicular tissue

42
Q

composition of the juxtacanicular tissue:

A

it is a sheet of connective tissue (a membrane) with no holes/openings in it

43
Q

where is the canal of scheme located?

A

external to the trabecular meshwork (between sclera and trabecular meshwork)

44
Q

purpose of the canal of Schlemm

A

to collect aqueous

45
Q

canal of scheme is lined with _____

A

endothelium

46
Q

the cross section of the canal of scheme is oval. where is the long axis?

A

the long axis is parallel with the surface of the sclera

47
Q

with gonioscopy, what does Descemet’s appear as?

A

a glistening white line on the “horizon” (called Schwalbe’s line)

48
Q

what is the only way you can see iris processes?

A

(also called pectinate fiends) seen with gonioscopy only

49
Q

list the 2 types of accessory channels of the canal of scheme

A
  1. external collector channels

2. large external canals (squeal veins of Ascher)

50
Q

route of the canal of schlemm - external collector channels

A

deep scleral plexus -> intrascleral plexus -> surface of sclera (episcleral veins)

51
Q

route of the canal of schlemm- large external canals (aqueal veins of ascher)

A

from sclera directly to episcleral vein

52
Q

what % of the aqueous drainage is through the trabecular meshwork/ canal of schlemm system?

A

90 % of the flow/drainage of aqueous

53
Q

where is the remaining 10% of the aqueous drained?

A

absorption of aqueous into the stroma of the iris and ciliary body -> choroid -> vortex vein

54
Q

the aqueous supplies nutrients to:

A

structures in anterior chamber without blood vascular system (the cornea and lens)

55
Q

other functions of the aqueous humor

A
  • to take away metabolic wastes
  • to maintain IOP
  • an optical component
56
Q

what is important about aqueous humor and IOP

A
  • IOP keeps the anterior chamber in its position and form

- IOP is a balance between production and drainage

57
Q

where is production of aqueous humor?

A

from ciliary processes of ciliary body

58
Q

aqueous humor is a derivative of: ___

A

blood plasma

Ocular Anatomy (20 decks)

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