|
|
| (3 intermediate revisions by the same user not shown) |
| Line 1: |
Line 1: |
| {|
| | [[Template:Hearing timeline table|hearing timeline]]<noinclude>[[Category:Template]][[Category:Term Link]][[Category:Timeline]][[Category:Hearing]][[Category:Third Trimester]][[Category:Fetal]]</noinclude> |
| |+ Hearing Timeline
| |
| |-
| |
| ! Stage
| |
| ! Event
| |
| |-
| |
| | Week 9
| |
| | Mesenchyme surrounding membranous labryinth (otic capsule) chondrifies.
| |
| |- | |
| | Week 12-16
| |
| | Capsule adjacent to membranous labryinth undegoes vacuolization to form a cavity (perilymphatic space) around membranous labrynth and fills with perilymph.
| |
| |-
| |
| | Week 18
| |
| | ectodermal plug in external auditory meatus breaks down.
| |
| |-
| |
| | Week 16-24
| |
| | Centres of ossification appear in remaining cartilage of otic capsule form petrous portion of temporal bone. Continues to ossify to form mastoid process of temporal bone.
| |
| |-
| |
| | Week 18 - 22
| |
| | Organ of corti structural elements develop. ({{GA}} 20 - 24 weeks)
| |
| |-
| |
| | 26 weeks
| |
| | human brainstem auditory pathway is anatomically formed.
| |
| |-
| |
| | 28 weeks
| |
| | AABR can be recorded.
| |
| |-
| |
| | 3rd Trimester
| |
| | Vibration acoustically of maternal abdominal wall induces startle response in fetus.
| |
| |}<noinclude>[[Category:Template]][[Category:Timeline]][[Category:Hearing]][[Category:Third Trimester]][[Category:Fetal]]</noinclude>
| |
