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Microanatomy Exam 4 > Eye > Flashcards

Eye Flashcards

1
Q

Corneal epithelium

A

Stratified squamous non-keratinized (5-6 layers thick)

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2
Q

Turnover time of corneal epithelium

A

7 days

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3
Q

Germinal cells of corneal epithelium are located where?

A

Basal layer at limbus-cornea junction

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4
Q

What is Bowmna’s membrane?

A

Basal lamina that support epithelium

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5
Q

Thickest layer of cornea

A

Substantia propria (stroma)

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6
Q

Tissue of corneal stroma

A

Dense regular CT → highly ordered collagen fibers

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7
Q

Fibroblasts of substantia propria may be called?

A

Keratocytes

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8
Q

Function of corneal endothelium

A

Keep stroma dehydrated

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9
Q

Anterior surface of iris

A

Covered by fibroblasts and collagen fibers → no epithelium

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10
Q

Posterior surface of irus

A

Pigmented myoepithelial cell lining

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11
Q

Stromal layer of iris

A
  1. Areolar CT
  2. Melanin-containing cells
  3. Blood vessels
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12
Q

Anterior uvea

A

Ciliary body and iris

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13
Q

2 types of mm. in iris

A
  1. Pupillary sphincter m. (parasympathetic)

2. Pupillary dilator m. (sympathetic)

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14
Q

Ciliary m. innervated by?

A

Parasympathetic

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15
Q

What are corpora nigra?

A

Iris granules → those neat little pyramids in horse and ruminants!

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16
Q

Flow of aqueous humor

A
  1. Produced by ciliary processes
  2. Posterior chamber
  3. Pupil
  4. Anterior chamber
  5. Drained at filtration angle
  6. Canal of Schlemm
  7. Continuous with scleral vv.
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17
Q

Ora serrata

A

Transition from optic to blind part of retina

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18
Q

Functions of RPE

A
  1. Phagocytic ability
  2. Dehydrate retina
  3. Create immune privilege space
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19
Q

Rods contain a pigment called?

20
Q

Cones contain a pigment called?

21
Q

Rhodopsin and iodopsin are?

A

Photoreceptor proteins

22
Q

What is Muller cell?

A

Neuron support cell in the retina

23
Q

Scotopic vision

A

Night vision → rods

24
Q

Photopic vision

A

Daylight → cones

25
Q

Rods or cones are more sensitive to intensity?

A

Rods > cones

26
Q

Rods or cones are more responsible for color?

27
Q

3 neuron system of the retina

A
  1. Nuclei of rods and cones
  2. Inner nuclear layer
  3. Layer of ganglion cells
28
Q

Inner nuclear layer includes?

A
  1. Bipolar cells
  2. Horizontal cells
  3. Amacrine cells
29
Q

What is the optic n. fiber layer?

A

Non-myelinated axons of ganglion cells

30
Q

Plexiform layers

A

Areas of synapse between neuronal cells (between nuclear layers)

31
Q

Fovea

A

Conical depression in retina where visual axis of cornea and lens meets retina → has least refractory distortion

32
Q

Macula lutea

A

Ovoid yellow area surrounding fovea

33
Q

What is at the retina?

A
  1. Flattened inner layers
  2. No blood vessels
  3. Mainly cones
34
Q

Afferent fibers of optic n. are or are not myelinated

A

Not myelinated → does not obstruct light

35
Q

When does optic n. first have myelination?

A

Optic disc

36
Q

Dura matter is continuous with?

37
Q

Pia-arachnoid is continuous with?

A

Uveal tract

38
Q

Main blood supply of retina

A

Central a. of retina (branch of ophthalmic a.)

39
Q

Lens epithelium is cuboidal and only present on what aspect of the lens?

40
Q

Where does zonule attach?

A

Suture (where ends of lens fibers come together)

41
Q

Palpebral conjunctiva

A

Stratified columnar with goblet cells

42
Q

Tarsal gland

A

Large sebaceous glands → oily film covers tears

43
Q

Skeletal m. in the eyelids

A

Orbiularis oculi m.

44
Q

Lacrimal glands produce?

A

Tears (similar to plasma, contain lysozyme)

45
Q

What is cherry eye?

A

Prolapse of superficial gland of 3rd eyelid

Microanatomy Exam 4 (14 decks)

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