Template:Hearing timeline table: Difference between revisions
From Embryology
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|+ Colspan=2|Hearing Timeline | |+ Colspan=2|Hearing Timeline | ||
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! width=150px| | ! width=150px|Developmental Time | ||
! Event | ! Event | ||
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| ectodermal plug in {{external auditory meatus}} breaks down. | | ectodermal plug in {{external auditory meatus}} breaks down. | ||
|-bgcolor="F5FAFF" | |-bgcolor="F5FAFF" | ||
| Week 16-24 | | 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. | | 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. | ||
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Revision as of 12:54, 14 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 | |
