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Canine Anatomy > EYE (E3) > Flashcards

EYE (E3) Flashcards

1
Q

Define adnexa

A

The group of structures surrounding the eyeball which provide protection and movement

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2
Q

What portion of tear film do the tarsal glands produce?

A

the oily portion

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3
Q

What portion of the tear film do the gland of the 3rd eyelid and the lacrimal gland produce?

A

the aqueous portion

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4
Q

What is another name for the 3rd eyelid?

A

plica semilunaris

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5
Q

What is the orbit?

A

the cavity containing the eyeball

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6
Q

What is the periorbita?

A

a cone-shaped sheath of CT and smooth m that encloses the eyeball and its muscles, vessels and nerves

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7
Q

outermost layer of the eyeball?

A

cornea

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8
Q

How do you recognize the sclera?

A

the white of the eye

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9
Q

what is the choroid?

A

the pigmented posterior portion of the vascular coat of the eyeball

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10
Q

What is the fundus?

A

the posterior portion of the eyeball

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11
Q

What is the fluid posterior to the lens?

A

jelly-like vitreous body

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12
Q

What is the fluid anterior to the lens?

A

aqueous humor

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13
Q

What is the retina?

A

part of the internal coat of the eyeball. contains rods and cones

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14
Q

palpebral fissure

A

the opening between the 2 eyelids

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15
Q

medial and lateral palpebral commissures

A

where the uper and lower eyelids join (medial and lateral)

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16
Q

palpebral conjunctiva

A

mucosal membranes that line the inner eyelids

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17
Q

bulbar conjunctiva

A

mucosal membranes that covers the sclera

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18
Q

conjunctival sac

A

bound externally by palpebral conjunctiva and interally by bulbar conjunctiva. opens at the palpebral fissure

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19
Q

lacrimal gland

A

on dorsolateral border of eyeball, medial to orbital ligament; makes tears

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20
Q

levator palpebrae superioris muscle

A

innervated by the oculomotor nerve (III); begins at the apex of the orbit, over the dorsal rectus; thin muscle that controls the movement of the eyelid

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21
Q

dorsal rectus muscle

A

innervated by the oculomotor nerve (III); attaches dorsally to eyeball

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22
Q

medial rectus muscle

A

innervated by the oculomotor nerve (III); attaches medially to eyeball

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23
Q

ventral rectus muscle

A

innervated by the oculomotor nerve (III); attaches ventrally to eyeball

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24
Q

retractor bulbi muscle

A

innervated by the abducens nerve (VI); surrounds the optic nerve with its four fascicles; when contracted, third eyelid is able to cover eyeball

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25
Q

lateral rectus muscle

A

innervated by the abducens nerve (VI); attaches laterally to eyeball

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26
Q

dorsal oblique muscle

A

innervated by the trochlear nerve (IV); passes through a groove in the trochlea (cartilaginous structure medially) and then courses laterally

27
Q

ventral oblique muscle

A

innervated by the oculomotor nerve (III); attaches near where lateral rectus attaches and courses medially across ventral rectus

28
Q

trochlea

A

a smooth, grooved cartilaginous process shaped like a pulley in the eye medially; dorsal oblique muscle is set within a groove

29
Q

superficial gland of the third eyelid

A

gland attached ventrally to the third eyelid

30
Q

external fibrous coat is composed of?

A

sclera and cornea

31
Q

limbus

A

border between cornea and sclera

32
Q

middle vascular coat (uvea) made up of?

A

choroid, ciliary body, and iris

33
Q

iris

A

contains circular and radial smooth muscle; allows/restricts light from entering eyeball

34
Q

choroid

A

middle, vascular layer of the eye; attaches firmly to the inside of the sclera

35
Q

ciliary body

A

located between the iris and choroid; contains numerous muscle bundles that regulate the shape of the lens

36
Q

ciliary processes

A

longitudinal tissue folds at the anterior part of the ciliary body; anchor zonular fibers

37
Q

lens

A

a structure that focuses the light on the retina; held in place with zonular fibers between two chambers in the eye

38
Q

vitreous chamber

A

most posterior chamber of the eye, filled with vitreous body

39
Q

optic disk

A

blind spot; an opening in the retina where the optic nerve fibers exit the eye

40
Q

1

A

external fibrous layer of the eye

41
Q

2

A

middle vascular (uvea) layer of the eye

42
Q

3

A

internal layer (retina)

43
Q

A

A

dorsal rectus

44
Q

B

A

medial rectus

45
Q

C

A

Ventral rectus

46
Q

D

A

lateral rectus

47
Q

a

A

dorsal oblique

48
Q

b

A

ventral oblique

49
Q

action of dorsal rectus?

A

elevates the globe

50
Q

which CN is dorsal rectus innervated by?

A

CN III

51
Q

Action of ventral rectus?

A

Depresses the globe

52
Q

which CN is the ventral rectus innervated by?

A

CN III

53
Q

action of medial rectus

A

turns the globe medially (nasally)

54
Q

which CN is the medial rectus innervated by?

A

CN III

55
Q

action of the lateral rectus?

A

turns globe laterally

56
Q

which CN innervates lateral rectus?

A

CN VI (Abducens)

57
Q

action of dorsal oblique?

A

rotates the 12 o’clock position medially (intortion of the globe)

58
Q

which CN innervates the dorsal oblique?

A

CN IV (Trochlear)

59
Q

action of ventral oblique

A

rotates the 12 o’clock position laterally (extortion of the globe)

60
Q

which CN innervates the ventral oblique?

A

CN III

61
Q

action of the retractor bulbi?

A

retract the globe

62
Q

which CN innervated the retractor bulbi?

A

CN VI (Abducens)

63
Q

dilation of the pupil

A

mydriasis

64
Q

constriction of the pupil

A

miosis

Canine Anatomy (22 decks)

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