Template:Hearing timeline table: Difference between revisions
From Embryology
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|+ | |+ colspan=2|'''Hearing Timeline''' | ||
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! width=150px|Developmental Time | ! width=150px|Developmental Time | ||
! Event | ! Event | ||
|- | |- | ||
| Week 9 | | [[Week 9]] | ||
| Mesenchyme surrounding membranous labryinth (otic capsule) chondrifies. | | Mesenchyme surrounding membranous labryinth (otic capsule) chondrifies. | ||
|-bgcolor="F5FAFF" | |-bgcolor="F5FAFF" | ||
Latest revision as of 23:36, 31 May 2018
| Developmental Time | 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 endochondral 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. |
| Links: hearing | timeline | |
