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Cell Biology Exam 2 > Ear > Flashcards

Flashcards in Ear Deck (47):
1

cerumen

ear wax. part seaceous secretions, part skin

2

lateral 1/3 of external ear is what

cartilaginous

3

medial 2/3 of ear is what

bone

4

Middle ear

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

5

Internal Ear

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

6

Epithelium in middle ear

simple squamous/cuboidal with interspersed goblet cells

7

External layers of typanic membrane

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

8

Intermediate layer of tympanic membrane

collagen and elastic fibers radiate out and fill this layer
fibroblasts will regenerate the tympanic membrane if it's perforated

9

Internal surface of tympanic membrane

continuous with middle ear cavity epithelium
simple squamous to simple cubodial

10

2 exit pathways of the middle ear

auditory (eustachian) tube and mastoid air cells

11

Ossicles are lined with what

simple squamous (and cubodial) epithelium

12

Tensor tympani

muscle attached to malleus
innervated by CN V

13

Stapeius

muscle attached to stapes
innervated by CN VII

14

Damage to CN V and CN VII leads to what

tinnitus

15

Auditory (Euchatian) tube

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

16

Bony Labryinth

Found within the petrous portion
contains the membranous labyrinth

17

membranous labyrinth

series of sacs and tubules
has specialized sensory cells

18

Endolymphatic space

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

19

perilympatic space

inside of the membranous labyrinth

20

cortilymphatic space

intercellular region found in the oragn of corti inside the cochlea

21

Oval window

where the footplate of stapes sits
inlet into the bony labryinth

22

round window

covered in secondary tympanic membrane
allows pressure release

23

vestibule

middle enlargement where the oval window sits
both cochlea and semicircular canals meet here

24

semicircular canal

2 orthogonal arches
swell as they meet the vestibule

25

Angular movement

sensing our position in space. done by semicircular canals

26

Cochlea

detects sound

27

Ions in endolymph

high in K+, low in Na+

28

utricle and saccule

detect linear movement

29

Type I hair cells

afferent nerve ending surrounds the entire cell

30

Type II hair cells

afferent nerve ending sits at base of cell

31

Kinocilia

have traditional cilia structure

32

Stereocilia

are projections of the plasma membrane

33

Crista Ampullaris

senses angular, rotational movements of head

34

Otolithic membrane

similar to crista ampullaris
has gelatinous caps and hair cells

35

Otoliths

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

36

Scala media

filled with endolymph

37

Scala vestibuli

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

38

Scala tympani

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

39

Oval window leads to what

scala vestibuli

40

round window leads to what

scala tympani

41

Triangular space

medial tip of triangle is modiolus, the body core
lateral wall is the bony cochlear wall

42

Bestibular (reissner's membrane)

top of triangle
divides the scala vestibuli from the scala media

43

Stria Vascularis

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

44

Basilar membrane

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

45

Phalangeal cells

support cells for hair cells
inner phalangeal cells surround the inner hair cells completely

46

Pillar cells

form inner spiral tunnel

47

Tectorial membrane

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