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head and neck Finals > Eyeball > Flashcards

Eyeball Flashcards

1
Q

Midpoint of post curvature; pt between the optic disc and the fovia centralis

A

Post pole

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2
Q

The line that joins two poles

A

Anatomical axis

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3
Q

The direction of the light that enters the eyeball for you to be able to see an object;

A

Visual axis

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4
Q

Line that joins the midpoint of the lens and the fovea centralis

A

Visual axis

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5
Q

Most acute vision

A

Fovia centralis

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6
Q

Halfway bet ant and post poles

A

Equator

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7
Q

Divides the eyeball

A

Equatorial plane

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8
Q

divides eyeball into medial (nasal) and lateral (temporal) halves

A

Vertical meridional plane

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9
Q

Divide the eyeball into upper and lower halves

A

Horizontal Meridional plane

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10
Q

The wall of the eye has 3 layers, coats or tunics

A

Fibrous coat
(Middle) Vascular coat/ uveal tract
(Innermost) nervous coat

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11
Q

Outermost coat
Composed of connective tissue, collagen fibers
For protection and maintaining normal dimensions of eyeball

A

Fibrous coat

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12
Q

Middle coat

Where the blood vessels are located

A

Vascular coat

Uvea / uveal tract

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13
Q

Innermost coat

Retina; Sensory rceptor itself; made up of neurons

A

Nervous coat

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14
Q

2 parts of fibrous coat

A
  1. Sclera

2. Cornea

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15
Q

Post 5/6
Starts at optic nerve, ends at limbous
WHITE OF THE EYE (opaque)

A

Sclera

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16
Q

Ant 1/6
Most powerful refractive media
Transparent

A

Cornea

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17
Q

3 parts of vascular coat

A
  1. Choroid
  2. Ciliary body
  3. Iris
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18
Q

Going anteriorly, the choroid ends at the insertion of _____________

A

Recti muscle

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19
Q

Layer of blood vessels of graded caliber ( from large to medium to small) supported by connective tissue rich in melanocyte

A

Choroid

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20
Q

Absorbs light rays and prevents it from being reflected to the other parts of the eyeball

A

Choroid

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21
Q

Wedge shaped; ends at the limbous

A

Ciliary body

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22
Q

Thin diaphragm that rests on the ant surface of the lens

A

Iris

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23
Q

Central aperture

A

Pupil

24
Q

Parts of the nervous coat

A

Retina

25
Q

The retina is composed of how many layers?

A

10 layers

Innermost 9 are neural in nature

26
Q

Cells of the pigmented layer of the retina

A

Pigment epithelium, non nervous,
SIMPLE CUBOIDAL EPITHELIAL CELLS
melanocytes

27
Q

Termination anteriorly

A

Scallop

28
Q

Termination of nervous retina

A

Ora serrata

29
Q

Beyond the ora serrata the continuation of nervous retina will be __________

A

SIMPLE CUBOIDAL EPITHELIUM

will cover any aspect of ciliary body and iris

30
Q

The inner lining of the ciliary and iris is a double layer of ____________

A

Neural and non neural simple cuboidal epithelial cells

31
Q

Region of ciliary body

A

Pars ciliaris retina

32
Q

Region of iris

A

Pars iridis retina

33
Q

The continuaiton of the nervous retina is non pigmented over ___________, but reaching the _____ it becomes pigmented too

A

Ciliary body, iris

Sa ciliary body, only outer is pigmented
Sa iris, yung double layer is pigmented (inner)

34
Q

Bends the light so that the focus falls exactly or close to the fovea centralis

A

Refractive media

35
Q

Refractive media

A

Cornea
Aq humor
Lens
Vitreous

36
Q

Most powerful refractive media

A

Cornea

37
Q

Responsible for sharp central vision

Located in the center of the macula region of the retina

A

Fovea centralis

38
Q

Not dynamic; gradually circulates ( found in both ant and post border of the eye

A

Aq humor

39
Q

Flexible; assumes more convexity or flattened

A

Lens

40
Q

Transparent gelatinous body of the chambers

A

Vitreous humor

41
Q

Remnant of hyaloid artery

A

Hyaloid canal

42
Q

Chambers of the eye

A

Anterior chamber
Posterior chamber
Viterous chamber

43
Q

Bounded anteriorly by cornea, posteriorly by the iris and lens

A

Anterior chamber

44
Q

The posterior chamber is bounded by

A

Ant: iris
Post: zonular ligaments of the lens / suspensory ligaments of the lens

45
Q

The vitreous chamber is bounded by _____

A

Ant: lens and ligaments
Post: retina

46
Q

Thickest posteriorly, fading anteriorly

A

Sclera

47
Q

Why is the posterior part of the sclera its weakest spot?

A

It is perforated by fibers of cranial nerve 2, optic nerve

48
Q

Junction bet cornea and sclera

A

Limbous

49
Q

Thin loose vascularized connective tissue

It has episcleral veins

A

Episclera

50
Q

Bulk of sclera

A

Collagen fibers, connective tissue

51
Q

Transition zone bet sclera and choroid
Here you will see melanocytes and elspastic fibers
It you see this it means you are near the choroid

A

Lamina fuscia

52
Q

5 layers of the cornea

A

ABCDE (ant-post, out-in)

  1. Ant epithelium
  2. Bowman’s membrane
  3. Connective tissue stroma (substancia propria)
  4. Descemet’s membrane
  5. Endothelium
53
Q

Stratified sq wet; usual mucous membrane; rich in nerve supply; extra sensitive; u do your corneal reflex here; regenerates easily because it is epithelial, injuries are not a problem except if it involves B; cont with conjuctival epithelium

A

Ant epithelium

54
Q

Basal lamina of ant epithelium
Fine collagen fibers
Resistant to entry of foreign bodies & MO
Scar formation when injured

A

Bowman’s membrane

55
Q

Midpoint of cornea

A

Ant pole

head and neck Finals (15 decks)

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