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Flashcards in Ectoparasites/Cytology Deck (263)
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1

What are the two groups Ectoparasites are divided into?

acarina: ticks, mites
insecta: fleas, grubs, lice

2

What life cycle involves incomplete metamorphosis?

Acarina

3

Mites normally eat ____ debris but some species puncture the skin to suck ______

skin, lymph fluid

4

What are three mites?

1) Demodex canis
2) Sarcoptes scabiei
3) Otodectes cynotis

5

Many insect parasites spend little time on the host...which insects are these? Which insect spends their entire life cycle on the host?

flies, mosquitoes, fleas--- in contrast lice

6

What are the two types of lice?

sucking and biting louse

7

What louse does this describe? Mouthparts adapted for puncturing the skin and sucking blood

Sucking

8

What louse does this describe? Feeds on the skin with mouth parts adapted for chewing

Biting louse

9

How do you identify a mite?

most common method skin scraping

10

What is the most scalpel blade used for skin scraping?

#10 scalpel blade

11

How do you do a skin scraping?

1) mineral oil and a slide
2) before scraping dip blade in mineral oil
3) hold blade at 45 degree angle
4) you can clip area before scraping for better visualization or to remove hair that interferes

12

Depth of scrape depends on _____ and suspected _____.

location, mite

13

What mites collect loose scale and crusts, so clippings not necessary?

surface dwelling mites

14

Intact specimen should be collected in a sealed container containing 10% ___ or ethyl alcohol.

formalin

15

Lice:
1) name of chewing lice which is smaller than sucking lice
2) They have a large rounded head that is the color ___
3) Characteristically the head of the chewing louse is ___ than the widest portion of the thorax

1) Mallophaga (chewing)
2) yellow
3) wider

16

Lice:
1) name of sucking lice?
2) larger then ____ lice
3) ___ to gray-dependent on amount of blood ingested from host
4) head is ___ than the widest part of the thorax
5) ____ like claws

1) Anoplura (sucking)
2) chewing
3) red
4) narrower
5) pincher

17

What grub is a Cuterebra?

bot fly

18

Larval stages of are often found in swollen, cyst like subcutaneous sites, with a fistula communicating to the outside environment where Larvae breathes through this pore

Cuterebra

19

Most economically important insect to the veterinarian?

flea

20

Sarcoptes scabiei:
1) extremely ___ scaling crusting and excoriation
2) ___, lateral elbows and ventral abdomen most common sites
3) spread by?

1) pruritic
2) ears
3) direct contact

21

T/F Repeated scrapings may be necessary to detect mites for Sarcoptes scabiei.

true

22

Notoedres cati:
1) ____ scabies mite
2) found mainly on the ears, back of neck, face, feet, extreme cases ___ body
3) Lesions very “____”
4) rare or common?
5) Easier to find in cats than the sarcoptic mite in ____

1) feline
2) entire
3) "crusty"
4) rare!
5) dogs

23

Otodectes cynotis:
1) __ mites
2) common cause of ________ in dogs and cats
3) Clinical signs: _______, scratching

1) ear mites
2) otitis externa
3) shaking head

24

Demodex reside in ____ and sebaceous glands of people and most domestic animals

hair follicles

25

Clinical disease caused by an increase in the number is mites is called?

demodicosis

26

T/F Sarcoptes scabi is known as the “Eight legged alligator”

false-Demodex

27

What are the four stages of Demodex?

1) egg
2) larva
3) nymph (proto and deutonymph)
4) adult

28

Cheyletiella (mite) species:
1) ____ dwelling (non burrowing)
2) visible to ________
3) enormous ____ like mouth parts
4) “____ “ structures on the legs
5) body shape: a ____, bell pepper, acorn

1) surface
2) the naked eye, large
3) hook
4) comb-like
5) shield

29

What is known as walking dandruff?

Cheyletiella species

30

____ thrive on blood obtained from the host.

ticks