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Neuroanatomy 2 > wiesbrod notes > Flashcards

wiesbrod notes Flashcards

1
Q

sclera is … (vascularity)

A

Avascular, but conjunctiva and episclera are vascular

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2
Q

3 components of the conjunctiva

A

palpebral
forniceal
bulbar

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3
Q

Location of the episclera

A

Between the conjunctiva and the sclera

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4
Q

Scleritis is

A

deep vessel condition

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5
Q

What fraction of refractive power does the cornea have?

A

2/3

Lens is 1/3

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6
Q

At the periphery vs centrally how thick is the cornea?

A

centrally - 0.54mm, peripherally ~1mm

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7
Q

5 layers of the cornea

A
  1. epithelium (stratified nonkerat squamous)
  2. Bowman’s layer (dense collagen)
  3. Stroma
  4. Descemet’s BM
  5. endolthelium (keep dehydrated)
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8
Q

which part of the cornea regenerates and which part doesnt

A

Epithelium regenerates

stroma DOES NOT

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9
Q

Describe collage in sclera vs cornea

A

In sclera - collagen is course/irreguled

In cornea - regular arrays, fine and regularly packed

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10
Q

2 ways a cornea can lose transparency

A
  1. Damaged by trauma

2. Swelling due to endothelial function loss

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11
Q

3 parts of the uvea

A
  1. Iris
  2. Ciliary body
  3. Choroid
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12
Q

2 functions of the ciliary body

A
  1. Production of aqueous humour

2 accommodation

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13
Q

How is glaucoma managed?

A
  1. decrease production by ciliary body

2. Increase aqueous outflow through trebcular meshwork

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14
Q

During accommodation what happens to the ciliary body and the zonula

A

Ciliary body skeletal muscle CONTRACTS -

Zonules RELAX

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15
Q

Components of the vitreous

A
  1. Mostly water (99%)
  2. Collagen (1%)
  3. Hyaluronic acid
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16
Q

How many layers does the light penetrate before reaching RPE

17
Q

What is the highly vascular portion of the uvea

18
Q

Describe the vacularity of the fovea

A

AVASCULAR! - important choroid supply

19
Q

what does the optic foramen contain?

A

Optic nerve and opthalmic artery

20
Q

what does the tear film contain? and what is it’s function

A
  1. Lipid layer
  2. aqueous layer
  3. Mucin layer
  • nourish the cornea and maintain refractive surface
21
Q

What produces the mucin layer and it’s function

A

Conjunctival goblet cells

Adherence to cornea

22
Q

what produces the aqueous layer and function

A

Accessory lacrimal glands

Bulk of tear film

23
Q

What forms the lipid layer and function

A

Meibomian gland in lid margin

reduces tear evaporation

24
Q

Function of the lacrimal gland

A

REFLEX tearing (CN 2, 5, and limbic)

25
Q

Accessory glands in the conjunctival fornix produce

A

basal secretion

26
Q

Function of superior rectus

A

Elevate

Adduction, incyclotorsion

27
Q

Function of Inferior rectus

A

Depress

Adduction, excyclotorsion

Neuroanatomy 2 (25 decks)

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