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Cell Biology Exam 2 > Ear > Flashcards

Ear Flashcards

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1
Q

cerumen

A

ear wax. part seaceous secretions, part skin

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2
Q

lateral 1/3 of external ear is what

A

cartilaginous

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3
Q

medial 2/3 of ear is what

A

bone

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4
Q

Middle ear

A

contains ossicles

transmits sound waves into mechanical energy which is imparted into fluid environment of ear

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5
Q

Internal Ear

A

fluid filled compartment
has multiple compartments with different ionic compositions
ionic differences helps detect fluid movment

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6
Q

Epithelium in middle ear

A

simple squamous/cuboidal with interspersed goblet cells

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7
Q

External layers of typanic membrane

A

thin epidermis
made of stratified squamous epithelium
continuous with thin skin of external acoustic meatus

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8
Q

Intermediate layer of tympanic membrane

A

collagen and elastic fibers radiate out and fill this layer

fibroblasts will regenerate the tympanic membrane if it’s perforated

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9
Q

Internal surface of tympanic membrane

A

continuous with middle ear cavity epithelium

simple squamous to simple cubodial

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10
Q

2 exit pathways of the middle ear

A

auditory (eustachian) tube and mastoid air cells

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11
Q

Ossicles are lined with what

A

simple squamous (and cubodial) epithelium

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12
Q

Tensor tympani

A

muscle attached to malleus

innervated by CN V

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13
Q

Stapeius

A

muscle attached to stapes

innervated by CN VII

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14
Q

Damage to CN V and CN VII leads to what

A

tinnitus

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15
Q

Auditory (Euchatian) tube

A

lined with pseudostratified columnar epithelium with goblet cells
equalizes pressure between middle ear and nasopharynx

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16
Q

Bony Labryinth

A

Found within the petrous portion

contains the membranous labyrinth

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17
Q

membranous labyrinth

A

series of sacs and tubules

has specialized sensory cells

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18
Q

Endolymphatic space

A

between inside wall of the bony labyrinth and the outer wall of the membranous labyrinth

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19
Q

perilympatic space

A

inside of the membranous labyrinth

20
Q

cortilymphatic space

A

intercellular region found in the oragn of corti inside the cochlea

21
Q

Oval window

A

where the footplate of stapes sits

inlet into the bony labryinth

22
Q

round window

A

covered in secondary tympanic membrane

allows pressure release

23
Q

vestibule

A

middle enlargement where the oval window sits

both cochlea and semicircular canals meet here

24
Q

semicircular canal

A

2 orthogonal arches

swell as they meet the vestibule

25
Q

Angular movement

A

sensing our position in space. done by semicircular canals

26
Q

Cochlea

A

detects sound

27
Q

Ions in endolymph

A

high in K+, low in Na+

28
Q

utricle and saccule

A

detect linear movement

29
Q

Type I hair cells

A

afferent nerve ending surrounds the entire cell

30
Q

Type II hair cells

A

afferent nerve ending sits at base of cell

31
Q

Kinocilia

A

have traditional cilia structure

32
Q

Stereocilia

A

are projections of the plasma membrane

33
Q

Crista Ampullaris

A

senses angular, rotational movements of head

34
Q

Otolithic membrane

A

similar to crista ampullaris

has gelatinous caps and hair cells

35
Q

Otoliths

A

bone fragments which sit on gelatinous caps
unique to macula
can be unseated, causing vertigo

36
Q

Scala media

A

filled with endolymph

37
Q

Scala vestibuli

A

space above cochlear duct when looking at coronal section
opening is located on vestibule
vibrations travel here first
filled with perilymph

38
Q

Scala tympani

A

space below cochlear duct when looking at coronal section
filled with perilymph
vibrations exit here

39
Q

Oval window leads to what

A

scala vestibuli

40
Q

round window leads to what

A

scala tympani

41
Q

Triangular space

A

medial tip of triangle is modiolus, the body core

lateral wall is the bony cochlear wall

42
Q

Bestibular (reissner’s membrane)

A

top of triangle

divides the scala vestibuli from the scala media

43
Q

Stria Vascularis

A

structure that makes endolymph
found on lateral wall of scala media
High in potassium

44
Q

Basilar membrane

A

floor of triangle
divides scala tympani from scala vestibuli
spiral organ of corti sits on this

45
Q

Phalangeal cells

A

support cells for hair cells

inner phalangeal cells surround the inner hair cells completely

46
Q

Pillar cells

A

form inner spiral tunnel

47
Q

Tectorial membrane

A

colalgen type II, V, and IX
otogelin and tecorin -glycoproteins
supported by the sterocilia of hair cells

Cell Biology Exam 2 (9 decks)

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