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Histology > Lecture 16: The eye > Flashcards

Lecture 16: The eye Flashcards

1
Q

Contents of fibrous tunic

A

Sclera

Cornea

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2
Q

Contents of vascular tunic (uvea)

A

Choroid
Ciliary body
Iris

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3
Q

Contents of inner tunic

A

Retina- which has optic disc and fovea centralis

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4
Q

Limbus

A

Layer between cornea and sclera

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5
Q

Episcleral layer

A

Outer layer
Collagen/elastic fibers
Vascular

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6
Q

Sclera proper

A

Collagen

Eye muscles attachment

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7
Q

Lamina cribosa

A

Sclera layer

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8
Q

Corneal epithelium

A

Stratified, nonkeratinized epithelium

High mitotic activity

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9
Q

Bowmans membrane

A

Collagen

Separates epithelium from stroma

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10
Q

Corneal stroma

A

Layer of collagen

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11
Q

Descemets membrane

A

Collagen

Separates stroma from endothelium

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12
Q

Corneal layers anterior to posterior

A 
Corneal epithelium
Bowmans layer
Stroma
Descemets membrane
Corneal epithelium
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13
Q

Choroid

A

Anterior to ora serrata
Highly vascularized
Forms choriocapillary network-provides nutrients to retina

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14
Q

Ciliary body

A

Wedge shaped
Produces aqueous humor
Suspensory ligaments of Zinn anchor lens in place
Have ciliary muscles innervated by parasympathetics that flatten or thicken lense

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15
Q

Aqueous humor pathway

A

Posterior chamber –>
Anterior chamber –>
Canal of Schlemm –>
Aqueous veins –>

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16
Q

Ciliary muscles _____ for close vision and ____ for long vision

A

Contract for close vision

Relax for long vision

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17
Q

Iris

A

Separates anterior/posterior chambers
Surrounds pupil
More melanocytes=darker

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18
Q

Ora serrata

A

Divides subdivisions of retina

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19
Q

Optic disc

A

Optic nerve exits here
Blind spot-lacks photoreceptors
Lacks bipolar/ganglion cells

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20
Q

Fovea centralis

A

Acute vision
Highest density of cone cells
Lacks rods and capillaries

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21
Q

Photosensitive region is ____ to ora serrata

A

Posterior

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22
Q

Anterior champer

A

Posterior to cornea, anterior to iris

23
Q

Posterior chamber

A

Posterior to iris, anterior to lens

24
Q

Vitreal chamber

A

Posterior to lens

Hyaloid canal with fetal artery in it

25
Q

Glaucoma

A

Increased intraocular pressure due to compromised aqueous humor drainage from anterior chamber

26
Q

Pigmented epithelium

A

Adjacent to choroid

27
Q

External limiting membrane

A

Area at junction of inner/outer segments of rods and cones and outer nuclear layer
Has adherens junctions b/w rods/cones and mueller cells

28
Q

Outer nuclear layer

A

Cell bodies of rods/cones

29
Q

Outer plexiform layer

A

Synapses between rods/cones and bipolar neurons and horizontal cells

30
Q

Inner nuclear layer

A

Cell bodies of bipolar, horizontal, mueller, amacrine cells

31
Q

Inner plexiform layer

A

Synapses b/w bipolar cells and ganglion cells

32
Q

Ganglion cell layer

A

Cell bodies of ganglion cells

33
Q

Optic nerve layer

A

Axons of ganglion cells

34
Q

Internal limiting membrane

A

Terminations of mueller cell processes and their basement membrane

35
Q

Pigmented epithelial cells location/function

A

In retina- Adjacent to choroid
Synthesize melanin
Connect via tight junction to form BBB
Esterify vitamin A

36
Q

Bipolar cells

A

Conducting neurons that synapse with rods/cones

37
Q

Horizontal cells

A

Interneurons that connect rods/cones with bipolar cells

38
Q

Amacrine cells

A

Interneurons connecting ganglion cells and bipolar neurons

39
Q

Muller cells

A

Neuroglia cells in retina
Form external limiting membrane
Internal limiting membrane formed by the basement of these cells

40
Q

Ganglion cells

A

Conducting neurons-axons form optic nerve

41
Q

Macula lutea

A

Surround fovea

Highest visual acuity

42
Q

Rods characteristics

A 
Spherule
Use rhodopsin
Low light
Black/white vision
Lamellae NOT continuous with plasmalemma
100 rod cells--1 bipolar cell
43
Q

Cones characteristics

A 
Pedicle
Use 3 kinds of iodopsins
High light
Visual acuity
Lamella continuous w/plasmalemma
1 cone cell- 1 bipolar cell
44
Q

Inner segment of photoreceptors

A

Mitochondria/organelles

45
Q

Cell body photoreceptor

A

Nucleus and short axon

46
Q

Outer segment photoreceptor

A

Modified cilium

Stacks of disks containing photoreceptors

47
Q

Disks in rod cells vs cone cells

A

Disk detach from cell membrane in rod cells, stay attached in cone cells

48
Q

Lens capsule

A

Insertion for suspensory ligament

Type IV collagen

49
Q

Lens nucleus

A

Fiberous area, no organelles, no nucleus really

50
Q

Glands of zeiss

A

Sebaceous glands in eye

51
Q

Glands of moll

A

Sweat glands

52
Q

Meibomian glands

A

Secretion keeps normal tear film in eye

53
Q

Palpebral fascia

A

Fibrous core of eyelid

54
Q

Palpebral conjuctiva

A

Lines nner surface of eyelid, covers eyeball

Histology (24 decks)

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