Neuro 3: Emb Of The Ear

Front 1

From what origin does the internal ear derive?

Back 1

Otic vesicle

Front 2

From what origin does the middle ear derive?

Back 2

1st pharyngeal pouch, ossicles from 1st and 2nd pharyngeal arches

Front 3

From what origin does the external ear derive?

Back 3

1st pharyngeal groove and mesenchymal hillocks associated with 1st and 2nd arch

Front 4

From what initial tissue is the membranous labyrinth formed?

Back 4

Surface ectoderm

Front 5

From what tissue is the otic vesicle formed?

Back 5

Surface ectoderm

Front 6

What appear as ectodermal thickenings on each side of the rhombencephalon at day 22 of the developing inner ear?

Back 6

Placodes

Front 7

What will otic pits detach to form during the inner ear?

Back 7

Otic vesicles

Front 8

Epithelial structures of the inner ear

Back 8

Membranous labryinth

Front 9

Components of the membranous labryinth of the inner ear are formed during what?

Back 9

As otic vesicle differentiates into dorsal and ventral parts

Front 10

Dorsal part of the otic vesicle

Back 10

Utricular

Front 11

Ventral part of the otic vesicle

Back 11

Saccular

Front 12

What does the utricular part of the otic vesicle give rise to?

Back 12

Semicircular duct and utricle

Front 13

What does the saccular part of the otic vesicle give rise to?

Back 13

Saccule and cochlear duct

Front 14

From what tissue does the bony labyrinth of the inner ear form?

Back 14

Mesenchyme (mesoderm)

Front 15

What makes up the bony labyrinth?

Back 15

Semicircular canal, cochlea, vestibule

Front 16

What does the cochlear duct form?

Back 16

Membranous cochlea

Front 17

Scala media AKA

Back 17

Membranous cholear duct

Front 18

The remaining connection between choclear duct and saccule

Back 18

Ductus reuniens

Front 19

The cartilage of the bony cochlea becomes vacuolized to form what?

Back 19

2 perilymphatic spaces: scala vestibuli and scala tympani

Front 20

Membrane between scala vestibuli and cochlear duct

Back 20

Vestibular membrane

Front 21

Membrane between scala tympani and cochlear duct

Back 21

Basilar membrane

Front 22

Point of attachment of cochlear duct to cartilage

Back 22

Spiral ligament

Front 23

What fills the scala vestibuli and scala tympani?

Back 23

Perilymph

Front 24

What fills the membranous labyrinth, including the cochlear duct?

Back 24

Endolymph

Front 25

Spiral organ AKA

Back 25

Organ of Corti

Front 26

Where does the organ of Corti lie?

Back 26

Basilar membrane

Front 27

What innervates the hair cells of the organ of Corti?

Back 27

Spiral or cochlear ganglion

Front 28

Where do the bipolar cells of the spiral or cochlear ganglion develop from?

Back 28

Otic placode and neural crest

Front 29

Portion of the saccular region that remains after the cochlear duct is formed.

Back 29

Saccule

Front 30

What is the semicircular duct filled with?

Back 30

endolymph

Front 31

What does the ampulla form on the end of?

Back 31

Semicircular ducts

Front 32

Where are sensory receptors formed in the ampulla of the inner ear?

Back 32

(Crista ampullaris)

Front 33

What 3 structures in the inner ear develop sensory receptors?

Back 33

ampulla of the semicircular duct, utricle and saccule

Front 34

What sensory receptors does the utricle develop?

Back 34

Macula utriculi

Front 35

What sensory receptors does the saccule develop?

Back 35

Macula sacculi

Front 36

Where is the auditory part of CN VIII found?

Back 36

Organ of Corti (SSA)

Front 37

Where is the vestibular division of CN VIII found?

Back 37

Vesitbular ganglion (SSA)

Front 38

What innervates the sensory receptors of the inner ear? (macula utriculi, macula sacculi and crista ampullaria)

Back 38

Vestibular ganglion

Front 39

From what is the tympanic cavity and eustachian tube of the middle ear formed?

Back 39

1st pharyngeal pouch

Front 40

Where are the ossicles located?

Back 40

Tympanic cavity

Front 41

What make up the ossicles?

Back 41

Malleus, incus and stapes

Front 42

From what do the malleus and incus of the middle ear develop?

Back 42

1st pharyngeal arch (mandibular)

Front 43

From what does the stapes of the middle ear develop?

Back 43

Second pharyngeal (hyoid) arch

Front 44

What is the tympanic cavity lined with?

Back 44

Endodermally derived epithelium

Front 45

Postnatally, what extends to form the mastoid air cells?

Back 45

Tympanic cavity

Front 46

From what does the tensor tympani muscle derive?

Back 46

1st arch

Front 47

What innervates the tensor tympani?

Back 47

Trigeminal (V3 mandibular division)

Front 48

From what does the stapedius muscle derive?

Back 48

2nd arch

Front 49

What innervates the stapedius muscle?

Back 49

Facial nerve (SVE)

Front 50

What dissolves to help form the eardrum in the 7th month?

Back 50

Meatal plug of external ear

Front 51

What is the auricle made up of?

Back 51

6 auricular hillocks (mesenchyme proliferations)

Front 52

What does the auricle form around?

Back 52

1st pharyngeal groove and dorsal ends of 1st and 2nd arches

Front 53

What is a feature of several sydromes, including 1st arch syndrome and chormosomal abnormalities?

Back 53

External ear malformation

Front 54

What are two types of congenital deafness?

Back 54

Neurosensory and Conduction

Front 55

What will Rubella do in the 1st trimester?

Back 55

damage to organ of Corti

Front 56

What type of congenital deafness would abnormal development of the cochlea, CN VIII or brain stem cause?

Back 56

Neurosensory deafness

Front 57

What type of congenital deafness would the persistence of meatal plug, fixation of footplate of stapes involve?

Back 57

Conduction deafness

Front 58

What responds to linear acceleration and the force of gravity?

Back 58

Utricle and Saccule

Front 59

What responds to angular acceleartion?

Back 59

Semicircular ducts of the utricular portion

Front 60

What part of the saccular portion of the inner ear is involved in hearing?

Back 60

Chochlear duct (organ of Corti)

Front 61

What contains the vestibular gangion of CN VIII?

Back 61

Internal auditory meatus of the utricular portion

Front 62

What contains the spiral ganglion of CN VIII?

Back 62

Modiolus of the bony labyrinth of the saccular portion

Front 63

What moves the malleus and what innervates it?

Back 63

Tensor tympani by V3

Front 64

From what membrane does the tympanic membrane develop?

Back 64

Pharyngeal membrane 1

Front 65

What innervates the tympanic membrane?

Back 65

CN 9 and V3

Front 66

What is the embryologic explanation of auricular appendages?

Back 66

Formation of accessory auricle hillocks