Emryology of Ear Development Flashcards Preview

Pediatric audiology CD 674 > Emryology of Ear Development > Flashcards

Flashcards in Emryology of Ear Development Deck (15)
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1
Q

Inner ear: auditory placode; auditory pit
Middle ear: tubotympanic recess begins to develop
What week does this take place?

A

3rd

2
Q

IE: auditory vesicle (otocyst); semicircular canals begin

What week does this takes place?

A

4th

3
Q

OE: primary auditory meatus begins

What week does this take place?

A

5th

4
Q

IE: utricle and saccule present; semicircular canals begin
OE: six hillocks evident; cartilage begins to form
What week does this take place?

A

6th

5
Q

IE: ductus reunion present; sensory cells in semicircular canals
ME: incus and malleus present in cartilage; lower half of tympanic cavity formed
OE: outer cartiliganeous 1/3 of external canal formed
What week does this take place?

A

8th

6
Q

IE: one cochlear coil present; sensory cells in utricle and saccule
OE: auricles move dorsolaterally
What week does this take place?

A

7th

7
Q

ME: 3 tissue layers at tympanic membrane are present

What week does this take place?

A

9th

8
Q

IE: 2.5 cochlear coils present; nerve VIII attaches to cochlear duct
What week does this take place?

A

11th

9
Q

IE: Sensory cells in cochlea; membraneous labyrinth complete; otic capsule begins to ossify
What week does this take place?

A

12th

10
Q

ME: cartilaginous stapes formed

What week does this takes place?

A

15th

11
Q

ME: ossification of malleus and incus begins

What week does this take place?

A

16th

12
Q

ME: stapes begins to ossify

What week does this take place?

A

18th

13
Q

IE: maturation of inner ear; inner ear adult size
OE: auricle is adult shape but continues to grow until age 9
What week does this take place?

A

20th

14
Q

ME: meatal plug disintegrates exposing tympanic membrane

What week does this take place?

A

21st

15
Q

ME: pneumatization of tympanum
OE: external auditory canal continues to mature until age 7
What week does this take place?

A

30th