Ear

Question 1

functions of adult ear

Answer 1

1. hearing

2. equilibrium

Question 2

three parts of the ear

Answer 2

external ear

middle ear

internal ear

Question 3

external ear

Answer 3

auricle (pinna)
external acoustic meatus
tympanic membrane

Question 4

middle ear

Answer 4

3 small ossicles

internal layer tympanic membrane

Question 5

inner ear

Answer 5

vestibulocohlear organ

Question 6

first indication of the ear (when)

Answer 6

Day 22

Question 7

first indication of the ear (as)

Answer 7

thickening of surface ectoderm

optic placode

Question 8

the optic placode appears on each side of

Answer 8

the myelencephalon

the caudal part of the hindbrain

Question 9

Inductive signals from the ___ stimulate the

Answer 9

inductive signals from the paraxial mesoderm and notochord stimulate the surface ectoderm to form the otic placodes

Question 10

otic placodes….

Answer 10

invaginate to form

otic or auditory vesicles (otocysts)

Question 11

otic placodes sink

Answer 11

deep into the underlying mesenchyme

Question 12

the otic placode edges

Answer 12

fuse and form the otic vesicle

Question 13

otic vesicle

Answer 13

primordium of the membranous labyrinth

Question 14

the otic vesicles give rise to

Answer 14

the internal ears

Question 15

ectodermal stalk attached to

Answer 15

the otic placode

Question 16

otic vesicle divides into

Answer 16

utricular part

saccular part

Question 17

the utricular part is

Answer 17

dorsal

Question 18

the saccular part is

Answer 18

ventral

Question 19

utricular

Answer 19

endolymphatic duct

utricle

semicircular ducts

Question 20

saccular part

Answer 20

saccule

cochlear duct

Question 21

saccular part
and
utricular part

Answer 21

membranous labyrinth

Question 22

the peripheral unfused part of the diverticula become

Answer 22

the semicircular ducts

Question 23

ampullae

Answer 23

dilations

at the end of each circular duct

Question 24

cristae ampullares

Answer 24

specialized receptor areas

Question 25

cristae ampullares differentiate in the

Answer 25

ampullae and

in the utricle and saccule

Question 26

cristae ampullares contain

Answer 26

cells for maintenance of equilibrium

Question 27

cristae ampullares detect

Answer 27

rotational acceleration

Question 28

saccular part of the otic vesicle, a __

Answer 28

tubular diverticulum

Question 29

the cochlear duct grows and coils to form

Answer 29

the membranous cochlea

Question 30

a connection with the saccule and membranous cochlea

Answer 30

ductus reuniens

Question 31

mesenchyme surrounding the cochlear duct differentiate into

Answer 31

cartilage

Question 32

____ differentiates from cells in the walls of the cochlear duct

Answer 32

spiral organ of corti