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PNS final > unit 8: special senses, inner ear (labyrinth) > Flashcards

unit 8: special senses, inner ear (labyrinth) Flashcards

1
Q

two parts of labyrinth:

___ labyrinth is an enclosure for the ___ labyrinth, which is bathed by perilymph from w/i the former

A

bony

membranous

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2
Q

three parts of bony labyrinth

A

cochlea
vestibule
semicircular canals

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3
Q

the __ is snail shell shaped and contains the cochlear duct, while the ___ contains the utricle and saccule

A

cochlea

vestibule

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4
Q

part of bony labyrinth that has lateral, anterior and posterior parts, and contain the semicircular ducts

A

semicircular canals

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5
Q

there is ___ within the membranous labyrinth, which contains a ___ labyrinth and a ___ labyrinth

A

endolymph
cochlear
vestibular

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6
Q 
utricle
saccule
semicircular ducts
utricosaccular duct
endolymphtic duct
endolymphatic sac
ductus reuniens
--are all found in the \_\_\_ labyrinth of the membranous labyrinth
A

vestibular

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7
Q

the bony part of the cochlea consists of a tube that is coiled 2.5-2.75x around a cone shaped central bony structure called the ___

A

modiolus

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8
Q

apex of the cochlea, which is directed anterolaterally

A

cochlear cupula

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9
Q

bony ridge that connects the cochlea to the modiolus

A

lamina of the modiolus

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10
Q

three channels of the cochlea

A

chochlear duct
scala vestibuli
scala tympani

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11
Q

the __ __ ends at the apex of the cochlea, and the scala vestibuli and scala tympani communicate with e/o at the apex thru a channel called the ____

A

cochlear duct

helicotrema

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12
Q
  • __ ___ is above the cochlear duct and is filled with perilymph.
  • OVAL window forms its base so ___ are transmitted into it as the stapes
A

scala vestibuli

vibrations

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13
Q
  • __ __ is below the cochlear duct, and it recieves vibrations from the scala vestibuli via the helicotrema
  • ___ window forms the base
A

scala tympani

round

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14
Q

the cochlear duct is in the middle of the __ __, with the scala vestib above and scala tymp below
-filled with ___

A

bony labyrinth

endolymph

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15
Q

the cochlear duct is attached to the ___ of the modiolus and anchored to the outer wall of the cochlea by the __ __

A

lamina

spiral ligament

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16
Q

cochlear duct is separated from the scala VESTIB by the ___ membrane, and from the scala TYMP by the ___ membrane

A

vestibular

basilar (spiral)

17
Q

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

A

spiral organ

18
Q

hairlike projections from the basilar/spiral membrane project superiorward in the __ __, and are sensitive to ___ & amplitude of soundwaves entering the cochlea

A

spiral organ

frequency

19
Q

hair cells of the spiral organ are covered by the __ __ and info will be conveyed from receptor cells to primary sensory neurons, which have cell bodies in the ___ ganglion

A

techtorial membrane

spiral

20
Q

sound transmission (1):

  • waves enter the EAM, causing __ __ to vibrate
  • ___ of middle ear transmit vibrations & amplify 1.2 times (maleus, incus, stapes)
  • the foot of stapes articulates with __ window, at the base of the scala vestib & amps the sound another 17 times
A

tympanic membrane
ossicles
oval

21
Q

sound transmission (2):

  • vibs from oval window transmit thru ___ of scala bestib and tymp, to reach the round window
  • wave transmitted causes __ __ to vib, stims receptors in spiral organ
  • info transmitted to __ nerve
A

perilymph
basilar membrane
cochlear

22
Q

vestibular labyrinth consists of 2 sacs, __ & ___ and 3 semicircular ducts (ant, lat, post)
-endolymph in all

A

saccule

utricle

23
Q

in the vestib labyrinth, the __ comm with the cochlear duct, while the larger ___ comm with all 3 semicirc ducts, as well as with the former via the utricosaccular duct

A

saccule

utricle

24
Q

hairlike sensory organ projections w/i saccule and utricle bathed in endolymph

A

maculae

25
Q
  • organs floating on endolymph surrounding maculae

- movements of head cause them to deflect the maculae, eliciting impulses

A

otoliths

26
Q

the ___ detects linear accel while the the ___ detects centrifugal and vertical accel

A

saccule

utricle

27
Q

sense organs w/i the semicirc ducts that are located in the ampulla of each

A

crista

28
Q

semicircular ducts are sensitive to accel in any direction, but are partic sens to ___ accel

A

rotational

29
Q

impulses initiated by the sense organs w/i the vestib labyrinth are carried by neurons with CB in the ___ ganglion

  • dendrites to it collected in superior & inferior branches
  • axons from ganglion make up vestib nerve
A

vestibular

30
Q

the SUPERIOR branch is larger, carries info from the __ & __ semicirc ducts, utricle, and some from the saccule (voit’s)
-12k fibers

A

anterior

lateral

31
Q

the INFERIOR branch carries info from the __ semicirc duct and the ___
-8k fibers

A

posterior

saccule

32
Q

two arteries supplying blood to the labyrinth

A 
internal auditory (from basilar a.)
stylomastoid (from post auricular a)
33
Q

sympathetic nerve supply to the labyrinth is from the ___ and/or ___ ___ plexuses

A

cavernous

internal carotid

34
Q

__ nerve is composed of axons from cells in spiral ganglion

A

cochlear

35
Q
  • in the labyrinth, info is relayed thru the cochlear nuclei to the __ __ and __ nuclei in the MO
  • info then carried in the lateral lemniscus to the inferior colliculi and medial geniculate bodies
  • relayed to temp lobe, Brodmann areas __ & __
A

superior olivary
trapezoid
41 & 42

36
Q
  • vestib nerve is made up of axons from the ___ ganglion
  • these axons are carried to __ __ __ of the MO
  • info processed in cerebellum
A

vestibular

vestibular nuclear complex

PNS final (12 decks)

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