Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

sclera and lens > Tear film > Flashcards

Tear film Flashcards

1
Q

The tears are a mixture of secretions from the _ and _

A

Main Lacrimal gland, accessory lacrimal gland and goblet cells & meibomion glands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The tears film contains a high concentration of

A

Proteins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The tear film is made up of _, _ and _

A

Albumin, lysozyme, and ganna globulin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The average ph of the tears _

A

7.4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The the three layers of the tear film are the _ layer, the _ layer and the _ layer

A

Superficial lipid, middle aqueous, mucin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The superficial lipid (oil) layer of the tear film is from the secretions of the _ and _

A

Meibumian glands, glands of Zeis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The _ prevents evaporation of the aqueous layer of the tear film

A

Lipid layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The middle aqueous layer of the tear film is secreted by the _ and _

A

Main lacrimal and accessory lacrimal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The _ layer of tear film contains lysozyme that is an antibacterial agent and antibodies ( predominantly immunoglobulin igA) that assist in bacterial invasion

A

Aqueous

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The mucin layer of the tear film is secreted by the _ in the conjunctiva

A

Goblet cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The _ of the tear film is partially absorbed by the corneal epithelium providing a hydrophilic ( water attracting) surface for the aqueous tears to spread on

A

Mucin layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Dry eyes are medically termed as

A

Keratoconjunctnitis sicca

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The_ secrete enough tears to keep the cornea wet under most circumstances and the _ secretes enough you help cover stressful circumstances such as drying from exposure to hot air, corneal injuries, foreign bodies and emotional upsets

A

Main & accessory lacrimal glands , main lacrimal gland

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Two tests for measuring tear function are

A

Schirmer and tear break up time - TBUT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Aqueous deficiency is the most common tear film problem and is treated with

A

Artificial tear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The _ is a thin transparent mucous membranes lining the inner surface of the eyelids and the globe

A

Conjunctiva

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The conjunctiva

A

Helps protect the eye from bacteria and produces the mucus layer of the tear film

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The _ form a transitional area between the bulbar and palpebral conjunctiva

A

Superior & inferior fornices

19
Q

The part of the conjunctiva that lines the inner lids is the _ conjunctiva

A

Palpebral

20
Q

The part that covers the the globe is called the _ conjunctiva

A

Bulbar

21
Q

The conjunctiva is composed of two layers , _ layer and the ___ layer

A

Epithelium, adenoid and fibrous

22
Q

The goblet cells that secrete mucus into the tear film are in the _ layer of the conjunctiva

A

Epithelium

23
Q

The _ deep layer is composed of blood vessels, nerves, glands, and compacted connective tissues containing Mueller’s muscle

A

Fibrous

24
Q

The accessory lacrimal glands are located in the _-

A

Fibrous layer of the conjunctiva

25
Q

The blood supply of the _ conjunctiva comes from the peripheral and marginal arterial arcades of the eyelid

A

Palpebral

26
Q

The blood supply of the _ conjunctiva comes from the only the peripheral arterial arcade and extends within 4mm of the limbus and anterior ciliary Arties

A

Bulbar

27
Q

The anterior ciliary arteries from superficial conjunctival and deep episcleral _ ( network of vessel) at the limbus that when inflamed is known as the ciliary flush

A

Pericorneal

28
Q

The bulbar conjunctival vessels are dilated in inflammations of the

A

Bulbar conjunctiva

29
Q

The superficial conjunctival peri-corneal plexus is infected in inflammation of the

A

Cornea

30
Q

The deep episcleral peri-corneal plexus is injected in inflammations of the

A

Iris and Ciliary body and in angle closure glaucoma

31
Q

The conjunctiva is innervated by the 1st and 2nd division of the_ cranial nerve

A

5th, trigeminal

32
Q

The _ is transparent avascular tissue that functions as a refracting and protective membrane

A

Cornea

33
Q

The corneal refractive power is equivalent to a _ diopter lens, which is about _ of the total refracting power of the eye ( 60 diopter)

A

+43 , 70%

34
Q

The average adult cornea is _ thick at the periphery __ thick in the center and __ in diameter

A

1mm, 0.5 to 0.6 , 11.5

35
Q

The corneal growth in humans is complete at about _

A

6 years of age

36
Q

The layers of the cornea from anterior to posterior are

A

Epithelium, bowmans layer, stroma, dua’s layers, descemets membrane, endothelium

37
Q

The _ regenerates when damaged and restricts passage of fluid to maintain transparency

A

Epithelium

38
Q

The cornea is innervated by the __ specifically the nasocililary branch that enters the stroma and branch to the epithelium

A

1st division of the trigeminal nerve

39
Q

_ is collagen zone not containing cells that is a barrier to microorganisms and does not regenerate if damaged, leaving scar

A

Bowman’s layers

40
Q

The _ makes up 90% of the total corneal thickness

A

Stroma

41
Q

The stroma is made up of __ in bundles arranged in a lamellar pattern parallel to the corneal surface, maintaining corneal transparency

A

Collagen fibrals

42
Q

The new layer of cornea was recently discovered called the _ . It is between the stroma and descemet’s membrane

A

Dua’s layers

43
Q

__ is a true basement membrane secreted by the underlying endothelium that is tough and resistant to penetration and can get folds in it during hypotony

A

Descemet’s membrane

44
Q

The _ is a single layer of hexagonal cells that get its oxygen from the aqueous and pumps waste and fluid from the stroma, keeping the cornea in a normal dehydrated state. The cells do not regenerate.

A

Endothelium

sclera and lens (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions