Special Sense Organs Part 5 Flashcards Preview

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Flashcards in Special Sense Organs Part 5 Deck (33)
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1

What two arteries carry the blood supply to the middle ear?

anterior tympanic branch of the internal maxillary artery and the tympanic branch of the internal carotid artery

2

What nerve provides the sensory supply to the middle ear?

tympanic nerve of CN IX

3

What nerves provide motor supply to the middle ear?

Nerve to the stapedius of the facial nerve and the medial pterygoid nerve of the mandibular division (supplies tensor tympani)

4

What nerves provide sympathetic supply to the middle ear?

caroticotympanic nerves

5

What nerves carry vasomotor and secretomotor fibers from the superior cervical ganglion to the middle ear by way of the internal carotid plexus?

caroticotympanic nerves

6

What are the two parts of the labyrinth (inner ear)?

bony and membranous

7

What is the enclosure for the membranous labyrinth?

bony labyrinth

8

What is the membranous labyrinth surrounded by within the bony labyrinth?

perilymph

9

What are the 3 parts of the bony labyrinth?

cochlea, vestibule, and semicircular canals

10

What part of the bony labyrinth is shaped like a snail shell and contains the cochlear duct?

cochlea

11

What part of the bony labyrinth contains the saccule and utricle?

vestibule

12

What part of the bony labyrinth is divided into the lateral, anterior, and posterior and contains the semicircular ducts?

semicircular canals

13

T/F: the membranous labyrinth is bathed in endolymph and contains perilymph.

False; bathed in perilymph, contains endolymph

14

What are the 2 main parts of the membranous labyrinth?

cochlear labyrinth and vestibular labyrinth

15

T/F: the cochlear labyrinth contains the utricle, saccule, semicircular ducts, utricosaccular duct, endolymphatic duct, endolymphatic sac, and ductus reuniens.

False; these are contained in the vestibular labyrinth; the cochlear labyrinth only contains the cochlear duct

16

The bony part of the cochlea consists of a tube coiled around a cones shaped central bony structure call what?

the mediolus

17

How many times does the cochlea wrap around the modiolus?

2.5-2.75 times

18

What is the term for the apex of the cochlea which is directed anteriolaterally?

the cochlear cupula

19

What is the name of the bony ridge that connects the cochlea to the modiolus?

the lamina of modiolus

20

What 3 channels make up the cochlea?

the cochlear duct, the scala vestibuli and the scala tympani

21

Where does the cochlear duct end?

at the apex of the cochlea

22

How do the scala tympai and the scala vestibuli communicated with each other?

at the apex through a channel called the helicotrema

23

T/F: the scala vestibuli is above the cochlear duct and filled with endolymph.

False; filled with perilymph

24

What forms the base of scala vestibuli allowing for vibrations to be transmitted from the stapes into the scala vestibuli?

oval window

25

The scala tympani is below the cochlear duct and vibrations from the scala vestibuli pass to the scala tympani via what structure? What is the base of the scala tympani?

helicotrema;
round window

26

What structure is in the middle of the bony labryrinthfilled with endolymph with the scala vestibule above and the scala tympani below?

cochlear duct

27

What structure is attached to the lamina of the modiolus, anchored to the outer wall of the cochlea by the spiral ligament, and separated from the scala vestibuli by the vestibular membrane?

cochlear duct

28

What separates the cochlear duct from the scala tympani?

the basilar or spiral membrane

29

Where is the spiral organ located? what is it attached to?

on the floor of the cochlear duct, attached to the basilar/spiral membrane

30

What structure of the inner ear has numerous hair-like projections superiorward that are sensitve to frequency and amplitude of sound waves that enter cochlea?

spiral organ