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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
Composed of smooth muscle fibers oriented in longitudinal, radial, and circular directions
Ciliary muscle
26
What are the layers of the ciliary muscle
1. Longitudinal muscle fibers 2. Radial fibers 3. Circular musle fibers
27
Which muscle lies adjacent to the supraciliaris and parallel to the sclera
Longitudinal fibers
28
How are the longitudinal muscle fibers situated
A long narrow V, the base of which is at the scleral spur, whereas the apex is in the choroid
29
What is hte most superficial ciliary muscle
Longtitudinal muscle fibers
30
Where is the longitudinal muscle fibers
Between choroid to scleral spur
31
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
Radial fibers
32
Where do the radial fibers insert
Near the base of the ciliary processes
33
What is the innermost region of ciliary muscle, annular muscle, is formed of circular muscle bundles with a sphincter type of action.
Circular muscle fibers
34
These fibers are located near the major circle of the iris
Circular muscle fibers
35
What is the purpose of the ciliary body muscles
Accommodation
36
The ciliary muscle is dally innervated by the _________
ANS
37
_____ stimulation activates the muscle for contraction
Parasympathetic
38
____ innervation likely has an inhibitory effect on ciliary body
Sympathetic
39
What is the main control of the innervation of the ciliary body
Parasympathetic
40
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
Stroma of ciliary body
41
Where does the stroma of the ciliary body lie
Between the ciliary muscle and the epithelial layers
42
What forms the core of each of the ciliary processes
Stroma of the ciliary body
43
What is contained in the processes of the ciliary body
Stroma and epithelium
44
Anteriorly, the ciliary body stroma is continuous with
Iris stroma
45
Posteriorly, the stroma of the ciliary is continuous with
Choroidal stroma
46
The __________ is located in the ciliary stroma anterior to the circular muscle and near the iris root
Major arterial circle of the iris
47
What is the major arterial circle of the iris formed by
The anastomosis of the long posterior ciliary arteries and the anterior ciliary arteries.
48
_______ cover the ciliary body and line the posterior chamber and part of the vitreous chamber
2 layers of the epithelium
49
How are the two epithelial layers of the ciliary positioned
Apex to apex because of invagination of the neural ectoderm in forming the optic cup
50
What connects the two layers of the ciliary epithelium
Intracellular junctions, desmosomes, and tight junctions,
51
What provides a means of cellular communication between the layers of the epithelium and are important for formation of the aqueous
Gap junctions between the apical surfaces
52
What layer of epithelium of the ciliary contain cellular components characteristics of cells actively involved in secretion
Both epithelial layers
53
Ciliary epithelium apex to apex orientation
1. Single layered optic vesicle 2. Optic cup invaginatipn 3. Dual layered cup
54
The ________ layer of epithelium is pigmented and cuboidal and the cells are joined by desmosomes and gap junctions
Outer
55
The pigmented ciliary epithelium is continuous anteriorly with
The anterior iris epithelium
56
Posteriorly, the pigmented ciliary epithelium is continuous with
The retinal pigment epithelium
57
What attaches the pigment epithelium to the stroma
Basement membrane
58
What is the basement of the pigmented epithelium of the ciliary continuous with anterior and posterior
Anteriorly: basement membrane of anterior iris epithelium Posterior: inner basement membrane portion of Bruch's membrane of the choroid
59
The ______ epithelium layer is nonpigmented and is composed of columnar cells in the pars plana and cuboidal cells in the pars plicata
Inner
60
What do the lateral walls of the cells of the inner epitheliual layer of hte ciliary contain
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
What is involved in the active secretion of aqueous humor components and serve as a diffusion barrier between blood and aqueous *****
Metabolically active nonpigmented epithelial cells | ******
62
Why do the nonpigmented epithial cells have a higher degree of metabolic activity?
Higher number of mitochondria
63
What has a significant role in the active secretion of aqueous humor components?
Nonpigmented cells of the inner epithelial layer of the ciliary body
64
What are the functions of the ciliary body
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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