EMB 2 ear development

Question 1

inner ear

what appears week 4?

it then does what? forming?

how does otic vesicle form? (this is primordium of what?)

Answer 1

Question 2

Question 3

Dorsal utricular part

forms what part?

dependent on what gene?

gives rise to primordial?

central regions?

peripheral?

Answer 3

Question 4

dorsal utricular part

localized dilations the ________ develop at one end of each _____ _____

what differentiates in the ampullae?

what form in utricle and saccule?

diverticulum grows from vesicle form?

Answer 4

Question 5

ventral saccular part

portion of otic vesicle that forms?

duct grows and ____ to form the ____ ____?

gene regulation?

connection of what and what forms?

Answer 5

Question 6

spiral and vestibular ganglion

spiral organ?

come from what ganglion cells that migrate?

nerve processes extend to the? where they terminate on?

Answer 6

Question 7

labyrinth development

otic vesicle induces what to differentiate into?

membranous labyrinth does what? what appear? forms?

this divides?

what forms bony labyrinth?

Answer 7

Question 8

hair cells

type of reception?

arises in what regions? in cochlea?

in saccule and utricle?

semicircular canals?

vestibular structures innervated by?

cochlea?

Answer 8

Question 9

Answer 9

Question 10

middle ear development

tubotympanic recess. proximal part forms? distaL?

cavity envelopes the ____ _____ associated with?

Answer 10

Question 11

Question 12

auditory ossicles

what two derived from PA1 cartilage?

wheres the other from?

invested by epithelia (from what)

ossicles where until 8th month?

mesenchyme? ossicles suspended by?

Answer 12

Question 13

2 muscles of middle ear?

inserts where does what?

comes from what embryological structure?

Answer 13

Question 14

external ear

what develops from dorsal ___ _______ ____

ectoderm _____ to form?

primordium of tympanic membrane is?

separates what?

tympanic membrane arise from? (3)

Answer 14

Question 15

external ear

auricle derived from?

what surrounds first pharyngeal groove?

these form what?

form where then move where? when?

lobue?

Answer 15

Question 16

summary of ear development

what forms 4th week? develops into?

divides? (dorsal/ventral part)

bony labyrinth develops from?

epi of tympanic cavity, mastoid antrum, and pharyngotympanic tube from?

auditory ossicles from?

epi of external acoustic meatus?

tympanic membrane derived from?

auricle develops from fusion of?

Answer 16

Question 17

congenital deafness

may result from?

most common sensory defect?

may be associated w/ ___ ____ syndrome

infection that can cause defects?

cause of conductive deafness? name of this?

Answer 17

Question 18

semicircular canal malformations

most common area?

this always accompanies what deformities

associated with?

Answer 18

Question 19

auricular abnormalities

what is common? may result from development of?

appear where?

consists of but may contain?

Answer 19

Question 20

microtia

what is it?

results from?

often an indicator of?

cause can be

Answer 20

Question 21

absence of external acoustic meatus?

what is normal?

results from?

Answer 21

Question 22

atresia of the external acoustic meatus

what is it?

as a result of?

superficial/deep parts?

abnormal development of?

Answer 22

Question 23

preauricular sinus

what is it? where? caused by? typically what side?

symptoms?

auricular fistulas

what is it?

Answer 23

Question 24

Answer 24

1. D
2. E

Question 25

Answer 25

3. A
4. A

Question 26

Answer 26

5. A
6. C

Question 27

Answer 27

7. B
8. A