Brainscape's Knowledge GenomeTM

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


See full index

Head and Neck > Lecture 15 Applied Anatomy and Physiology of the Orbit and Eye > Flashcards

Lecture 15 Applied Anatomy and Physiology of the Orbit and Eye Flashcards

1
Q

What type of epithelium lines the cornea

A

Stratified squamous non-keratinised

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

Name the layers of the cornea from top to bottom

A 
Epithelium
Bowman's membrane
Stroma (collagen)
Descement's layer
Endothelium
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is located in the endothelium that keeps aqueous humour out

A

A pump

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

What happens if aqueous humour gets into the cornea

A

Transparency is lost

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

What plays an important role in making the cornea transparent

A

Avascularity

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

What are the benefits of the cornea being avascular

A

when performing a graft surgery as it means there is a lesser chance of foreign antigens from a corneal graft being recognised by the recipient, so lesser chance of a graft rejection.

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

What is the top 2 layers of the retina called

A

Inner limiting membrane

Nerve fibre layer

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

What are the last 2 layers of the retina called

A

:ayers of rods and cones

Pigment epithelial layers

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

What layer surrounds the retina

A

Choroid

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

What is the choroid made up

A

Fenestrated blood vessel fo varying diameters which supply the outer layers of the retina

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

What are rods and cones

A

Photosensitive cells that react to light and help form action potentials

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

What is the purpose of the pigment epithelial layer

A

Maintaining health of rods and cones

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

What direction does light pass through

A

Top layers passes through layers of retina to rods and cones

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

How does the eye bypass all the layers of the retina

A

Has fovea centralis which is tightly packed with cones for maximum visual acuity
A the layers are pushed to the side at the fovea

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

Between cones and rods which are more light sensitive

A

Cones

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

What is the lens

A

Transparent, crystalline biconvex structure which is suspended by zones from the ciliary body

17
Q

What structure in the eyelids give them shap

A

Tarsal plate

18
Q

What is Meibomian gland

A

Secretes oil to coat tear film and prevent evaporation

19
Q

What is the lacrimal apparatus

A

Located in the upper and lower eyelid and drain tears

20
Q

Where is the lacrimal sac located

A

Media corner of orbit

21
Q

What are the 4 functions of the tear film

A

Keep cornea moist, prevents drying
Washes away foreign bodies
Has antibodies and lysozyme to kill microbes
Smooths outer surface of cornea- proving smooth surface for refractions

22
Q

Name the layers of the tera film

A

Layer 3- oily layer
Layer 2- aqueous layer
Layer 1- mucinous layer

23
Q

What innervation controls tear secretion into conjunctival sac

A

Parasympathetic (VII n)

24
Q

What stimulates further blinking

A

When aqueous layer evaporated the mucinous and oily layer touch each other and breaks up the tear film

Head and Neck (16 decks)

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