Ear

Question 1

cerumen

Answer 1

ear wax. part seaceous secretions, part skin

Question 2

lateral 1/3 of external ear is what

Answer 2

cartilaginous

Question 3

medial 2/3 of ear is what

Answer 3

bone

Question 4

Middle ear

Answer 4

contains ossicles

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

Question 5

Internal Ear

Answer 5

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

Question 6

Epithelium in middle ear

Answer 6

simple squamous/cuboidal with interspersed goblet cells

Question 7

External layers of typanic membrane

Answer 7

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

Question 8

Intermediate layer of tympanic membrane

Answer 8

collagen and elastic fibers radiate out and fill this layer

fibroblasts will regenerate the tympanic membrane if it’s perforated

Question 9

Internal surface of tympanic membrane

Answer 9

continuous with middle ear cavity epithelium

simple squamous to simple cubodial

Question 10

2 exit pathways of the middle ear

Answer 10

auditory (eustachian) tube and mastoid air cells

Question 11

Ossicles are lined with what

Answer 11

simple squamous (and cubodial) epithelium

Question 12

Tensor tympani

Answer 12

muscle attached to malleus

innervated by CN V

Question 13

Stapeius

Answer 13

muscle attached to stapes

innervated by CN VII

Question 14

Damage to CN V and CN VII leads to what

Answer 14

tinnitus

Question 15

Auditory (Euchatian) tube

Answer 15

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

Question 16

Bony Labryinth

Answer 16

Found within the petrous portion

contains the membranous labyrinth

Question 17

membranous labyrinth

Answer 17

series of sacs and tubules

has specialized sensory cells

Question 18

Endolymphatic space

Answer 18

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

Question 19

perilympatic space

Answer 19

inside of the membranous labyrinth

Question 20

cortilymphatic space

Answer 20

intercellular region found in the oragn of corti inside the cochlea

Question 21

Oval window

Answer 21

where the footplate of stapes sits

inlet into the bony labryinth

Question 22

round window

Answer 22

covered in secondary tympanic membrane

allows pressure release

Question 23

vestibule

Answer 23

middle enlargement where the oval window sits

both cochlea and semicircular canals meet here

Question 24

semicircular canal

Answer 24

2 orthogonal arches

swell as they meet the vestibule

Question 25

Angular movement

Answer 25

sensing our position in space. done by semicircular canals

Question 26

Cochlea

Answer 26

detects sound

Question 27

Ions in endolymph

Answer 27

high in K+, low in Na+

Question 28

utricle and saccule

Answer 28

detect linear movement

Question 29

Type I hair cells

Answer 29

afferent nerve ending surrounds the entire cell

Question 30

Type II hair cells

Answer 30

afferent nerve ending sits at base of cell

Question 31

Kinocilia

Answer 31

have traditional cilia structure

Question 32

Stereocilia

Answer 32

are projections of the plasma membrane

Question 33

Crista Ampullaris

Answer 33

senses angular, rotational movements of head

Question 34

Otolithic membrane

Answer 34

similar to crista ampullaris | has gelatinous caps and hair cells

Question 35

Otoliths

Answer 35

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

Question 36

Scala media

Answer 36

filled with endolymph

Question 37

Scala vestibuli

Answer 37

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

Question 38

Scala tympani

Answer 38

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

Question 39

Oval window leads to what

Answer 39

scala vestibuli

Question 40

round window leads to what

Answer 40

scala tympani

Question 41

Triangular space

Answer 41

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

Question 42

Bestibular (reissner's membrane)

Answer 42

top of triangle | divides the scala vestibuli from the scala media

Question 43

Stria Vascularis

Answer 43

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

Question 44

Basilar membrane

Answer 44

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

Question 45

Phalangeal cells

Answer 45

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

Question 46

Pillar cells

Answer 46

form inner spiral tunnel

Question 47

Tectorial membrane

Answer 47

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