Special Sense Organs Part 3 Flashcards Preview

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Flashcards in Special Sense Organs Part 3 Deck (33)
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1

Where are the tarsal glands located?

in each eyelid

2

What kind of gland are the tarsal glands?

sebaceous glands that secrete an oily substance that covers the eyes upon blinking

3

What is the purpose of the oily substance produced by the tarsal glands?

reduces evaporation of tears

4

All arteries of the eyeball are branches of what artery?

ophthalmic artery

5

Where are the long posterior ciliary arteries located?

one on each side of the eye running between the sclera and the choroid

6

How many short ciliary arteries enter the eyeball on the posterior surface forming a ring around the optic nerve?

six to twelve

7

How many anterior ciliary arteries arch over or under the eyeball?

six to eight (3 or 4 over and 3 or 4 under)

8

What artery travels via the optic nerve to the retina where it spreads out into an extensive network? It is the only artery to supply the retina.

Central retina artery

9

T/F: A thrombus/embolism in the central retinal artery will not result in blindness in that artery.

False; at least some blindness will result in that eye .No redundancy in blood supply to a single retina

10

What are the 3 sources of venous drainage for the eye?

anterior ciliary, long posterior ciliary, and central retinal veins

11

T/F: veins of the eye accompany arteries of similar names? i.e. anterior ciliary artery and anterior ciliary vein

True

12

What branches of the nasociliary nerve of the ophthalmic division of the trigeminal nerve provide nerve supply to the eyeball?

long ciliary nerves and short ciliary nerves

13

What nerves supply sensory info for the ciliary body, iris, and cornea?

long ciliary nerves

14

What nerves supply sensory info for the eyeball?

short ciliary nerves

15

What kind of fibers from the cavernous plexus pass through the ciliary ganglion and reach the ciliaris and dilator pupillae muscles?

postganglionic sympathetic fibers

16

What fibers from the ciliary ganglion follow a similar path to the ciliaris and sphincter pupillae muscles?

postganglionic parasympathetic fibers

17

What structure is known as an ectodermal thickening called the placode during embryological development?

ear

18

After the placode invaginates, it gives rise to the auditory pit which is then called what?

auditory vesicle

19

What "business part" will the auditory vesicle give rise to?

most of the membranous inner ear

20

What are the auditory tube and tympanic cavity derived from?

first pharyngeal pouch

21

What is the malleus derived from?

dorsal end of the ventral mandibular cartilage

22

What does the incus develop from?

dorsal end of the first pharyngeal arch

23

What is the stapes derived from?

dorsal end of the second pharyngeal arch

24

What is the tympanic membrane developed from?

interstitial mesoderm

25

What does the external acoustic canal develop from?

first pharyngeal groove

26

What does the auricle develop from?

a groove next to the first pharyngeal groove

27

What portions make up the ear?

external, middle, and inner portions

28

What is included in the external ear?

auricle and external acoustic meatus

29

What horn-like structure funnels sound waves, is composed of cartilage and is also known as pinna?

Auricle

30

What three extrinsic muscles position the auricle?

anterior, superior, and posterior auricular muscles