Hearing - Middle Ear Development: Difference between revisions
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== Middle == | |||
===tympanic cavity=== | |||
* derived from first pharyngeal pouch | |||
* extends as tubotympanic recess - during week 5 recess contacts outer ear canal | |||
* mesoderm between 2 canals forms tympanic membrane | |||
* expands to form tympanic recess | |||
* stalk of recess forms auditory tube(eustachian tube, pharyngotympanic tube) | |||
===Ossicles=== | |||
[[File:Pharyngeal arch cartilages.jpg|thumb|Pharyngeal arch cartilages]] | |||
* develop from first and second pharyngeal arches | |||
* tympanic cavity enlarges to incorporate | |||
* coats with epithelia | |||
* first arch mesoderm | |||
* tensor tympani muscle | |||
* malleus and incus | |||
* second arch mesoderm | |||
* stapedius muscle and stapes | |||
Middle Ear Genes - gooscoid, RARs, Prx1, Otx2, Hoxa1, Hoxb1, endothelian related molecules | |||
Revision as of 12:24, 4 June 2010
Introduction
The middle ear ossicles (bones) are derived from 1st and 2nd arch mesenchyme. The space in which these bones sit is derived from the 1st pharyngeal pouch.
Middle
tympanic cavity
- derived from first pharyngeal pouch
- extends as tubotympanic recess - during week 5 recess contacts outer ear canal
- mesoderm between 2 canals forms tympanic membrane
- expands to form tympanic recess
- stalk of recess forms auditory tube(eustachian tube, pharyngotympanic tube)
Ossicles
- develop from first and second pharyngeal arches
- tympanic cavity enlarges to incorporate
- coats with epithelia
- first arch mesoderm
- tensor tympani muscle
- malleus and incus
- second arch mesoderm
- stapedius muscle and stapes
Middle Ear Genes - gooscoid, RARs, Prx1, Otx2, Hoxa1, Hoxb1, endothelian related molecules
Glossary Links
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Cite this page: Hill, M.A. (2024, June 27) Embryology Hearing - Middle Ear Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Hearing_-_Middle_Ear_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G