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Ocular Block 6 > Ciliary Body > Flashcards

Ciliary Body Flashcards

1
Q

Borders of the ciliary body

A

Think of the ciliary body as an upside down triangle

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2
Q

Apex of the ciliary body

A

Terminates at the ora serrata where the retina/choroid ends

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3
Q

Base of the ciliary body

A

One tip terminates at the scleral spur, the middle of the base joins the root of the iris. The other tip of the base borders the posterior chamber

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4
Q

What do the legs of the triangle of the ciliary body border?

A

One leg borders the sclera

One leg borders the posterior chamber

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5
Q

A ring like, or circular structure just behind the iris and surrounding the crystalline lens of the eye

A

Ciliary body

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6
Q

What are the two parts of the ciliary body?

A
  1. Pars Plicata

2. Pars Plana

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7
Q

The wider, anterior portion containing the ciliary processes

A

Pars plicata

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8
Q

What are the regions between the ciliary processes called

A

Valleys of Kuhnt

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9
Q

What attaches to the valley of Kuhnt

A

Zonular fibers

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10
Q

What do the zonular fibers that attach to the valleys of Kuhnt do

A

Change the lens shape

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11
Q

Where do the zonular fibers really attach

A

Attach at plana and plicata. The ones attached to plana are the ones that run up the valley of Kuhnt

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12
Q

Flatter region of the ciliary body

A

Pars plana

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13
Q

Where does the pars plana extend from

A

From the posterior of the pars plicata to the ora serrata

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14
Q

What are the forward pointing spices of the ora serrata

A

Dentate processes

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15
Q

The rounded portions of the ora serrata that lie between the teeth are called

A

Oral bays

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16
Q

Fibers that attach between the ciliary body and the crystalline lens.

A

Zonule fibers

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17
Q

How do the zonule fibers course

A

From the ciliary body to the lens

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18
Q

Where do the zonule fibers insert

A
  • internal limiting membrane of the pars plana region and travel forward through the valleys between the ciliary processes
  • internal limiting membrane of the valleys of hte pars plicata
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19
Q

What ar the layers of the ciliary body from superficial to deep

A
  1. Supraciliaris
  2. Ciliary muscle
  3. Ciliary stroma
  4. Ciliary epithelium
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20
Q

The outermost layer of the ciliary body adjacent to the sclera

A

Supraciliaris layer of the ciliary body

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21
Q

What is the hybrid zone between the ciliary body and the sclera

A

Supraciliaris

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22
Q

What kind of tissue is supraciliaris

A

Loose connective tissue

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23
Q

What is contained in the supraciliaris layer of the ciliary body

A

-melanocytes, fibroblasts, and collagen bands

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24
Q

What does the arrangement of the supraciliaris allow for ?

A

Accumulation of fluid

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25
Q

Composed of smooth muscle fibers oriented in longitudinal, radial, and circular directions

A

Ciliary muscle

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26
Q

What are the layers of the ciliary muscle

A
  1. Longitudinal muscle fibers
  2. Radial fibers
  3. Circular musle fibers
27
Q

Which muscle lies adjacent to the supraciliaris and parallel to the sclera

A

Longitudinal fibers

28
Q

How are the longitudinal muscle fibers situated

A

A long narrow V, the base of which is at the scleral spur, whereas the apex is in the choroid

29
Q

What is hte most superficial ciliary muscle

A

Longtitudinal muscle fibers

30
Q

Where is the longitudinal muscle fibers

A

Between choroid to scleral spur

31
Q

Which ciliary muscle forms wider, shorter interdigitating Vs that originate at the scleral spur and inserts the connective tissue near the base of the ciliary processes

A

Radial fibers

32
Q

Where do the radial fibers insert

A

Near the base of the ciliary processes

33
Q

What is the innermost region of ciliary muscle, annular muscle, is formed of circular muscle bundles with a sphincter type of action.

A

Circular muscle fibers

34
Q

These fibers are located near the major circle of the iris

A

Circular muscle fibers

35
Q

What is the purpose of the ciliary body muscles

A

Accommodation

36
Q

The ciliary muscle is dally innervated by the _________

A

ANS

37
Q

_____ stimulation activates the muscle for contraction

A

Parasympathetic

38
Q

____ innervation likely has an inhibitory effect on ciliary body

A

Sympathetic

39
Q

What is the main control of the innervation of the ciliary body

A

Parasympathetic

40
Q

Highly vascularized, loose connective tissue that lies between the ciliary muscle and the epithelial layers and forms the core of each of the ciliary processes

A

Stroma of ciliary body

41
Q

Where does the stroma of the ciliary body lie

A

Between the ciliary muscle and the epithelial layers

42
Q

What forms the core of each of the ciliary processes

A

Stroma of the ciliary body

43
Q

What is contained in the processes of the ciliary body

A

Stroma and epithelium

44
Q

Anteriorly, the ciliary body stroma is continuous with

A

Iris stroma

45
Q

Posteriorly, the stroma of the ciliary is continuous with

A

Choroidal stroma

46
Q

The __________ is located in the ciliary stroma anterior to the circular muscle and near the iris root

A

Major arterial circle of the iris

47
Q

What is the major arterial circle of the iris formed by

A

The anastomosis of the long posterior ciliary arteries and the anterior ciliary arteries.

48
Q

_______ cover the ciliary body and line the posterior chamber and part of the vitreous chamber

A

2 layers of the epithelium

49
Q

How are the two epithelial layers of the ciliary positioned

A

Apex to apex because of invagination of the neural ectoderm in forming the optic cup

50
Q

What connects the two layers of the ciliary epithelium

A

Intracellular junctions, desmosomes, and tight junctions,

51
Q

What provides a means of cellular communication between the layers of the epithelium and are important for formation of the aqueous

A

Gap junctions between the apical surfaces

52
Q

What layer of epithelium of the ciliary contain cellular components characteristics of cells actively involved in secretion

A

Both epithelial layers

53
Q

Ciliary epithelium apex to apex orientation

A
  1. Single layered optic vesicle
  2. Optic cup invaginatipn
  3. Dual layered cup
54
Q

The ________ layer of epithelium is pigmented and cuboidal and the cells are joined by desmosomes and gap junctions

A

Outer

55
Q

The pigmented ciliary epithelium is continuous anteriorly with

A

The anterior iris epithelium

56
Q

Posteriorly, the pigmented ciliary epithelium is continuous with

A

The retinal pigment epithelium

57
Q

What attaches the pigment epithelium to the stroma

A

Basement membrane

58
Q

What is the basement of the pigmented epithelium of the ciliary continuous with anterior and posterior

A

Anteriorly: basement membrane of anterior iris epithelium

Posterior: inner basement membrane portion of Bruch’s membrane of the choroid

59
Q

The ______ epithelium layer is nonpigmented and is composed of columnar cells in the pars plana and cuboidal cells in the pars plicata

A

Inner

60
Q

What do the lateral walls of the cells of the inner epitheliual layer of hte ciliary contain

A

Extensive inter-digitations and are joined, near the Alice’s, by desmosomes, gap junctions, and zonula occludens, which form one site of the blood-aqueous barrier

61
Q

What is involved in the active secretion of aqueous humor components and serve as a diffusion barrier between blood and aqueous
*****

A

Metabolically active nonpigmented epithelial cells

****

62
Q

Why do the nonpigmented epithial cells have a higher degree of metabolic activity?

A

Higher number of mitochondria

63
Q

What has a significant role in the active secretion of aqueous humor components?

A

Nonpigmented cells of the inner epithelial layer of the ciliary body

64
Q

What are the functions of the ciliary body

A

The ciliary body produces and secretes the aqueous humor. It’s muscular causes accommodation and can affect aqueous outflow

Ocular Block 6 (7 decks)

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