File:Adult hearing embryonic origins.jpg: Difference between revisions

Revision as of 10:34, 9 May 2012

Adult Hearing Embryonic Origins

Many different embryonic components contribute to the sensory structures required for hearing. It is always considered/divided in terms of the 3 main divisions (external, middle and inner), each of which have their own separate components from different embryonic origins.

The complexity and time course of development leads to many associated abnormalities.

External Ear

Auricle - Pharyngeal Arches 1 and 2 (ectoderm, mesoderm)
- form from 6 hillocks (week 5) 3 on each of arch 1 and 2
External Auditory Meatus - Pharyngeal Arch 1 groove or cleft (ectoderm)
Tympanic Membrane - Pharyngeal Arch 1 membrane (ectoderm, mesoderm, endoderm)

Middle Ear

Middle Ear Ossicles
- Malleus and incus - Pharyngeal Arch 1 cartilage Neural crest (ectoderm)
- Stapes - Pharyngeal Arch 2 cartilage Neural crest (ectoderm)
Middle Ear Muscles
- Tensor tympani - Pharyngeal Arch 1 (mesoderm)
- Stapedius - Pharyngeal Arch 2 (mesoderm)
Middle Ear Cavity
- Pharyngeal Arch 1 pouch (endoderm)

Inner Ear

Inner Ear Labyrinth
- Cochlea - Otic vesicle - Otic placode (ectoderm)
- Semicircular canals - Otic vesicle - Otic placode (ectoderm)
- Saccule and utricle - Otic vesicle - Otic placode (ectoderm)
Cranial Nerve VIII
- Auditory component - Otic vesicle and neural crest (ectoderm)
- Vestibular component - Otic vesicle and neural crest (ectoderm)

Links: Image - Adult hearing embryonic origins | Image - without embryology | Sensory - Hearing and Balance Development

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:55, 27 September 2009		1,000 × 675 (80 KB)	S8600021 (talk \| contribs)

You cannot overwrite this file.

File usage

The following 15 pages use this file:

Revision as of 10:33, 9 May 2012 (view source) Z8600021 (talk \| contribs) (→‎Adult Hearing Embryonic Origins) ← Older edit		Revision as of 10:34, 9 May 2012 (view source) Z8600021 (talk \| contribs) (→‎Adult Hearing Embryonic Origins) Newer edit →
Line 32:		Line 32:


	'''~~Related images~~:''' [[:File:Adult hearing embryonic origins.jpg\|Image - Adult hearing embryonic origins]] \| [[:File:Hearing_cartoon.jpg\|Image - without embryology]]		'''Links:''' [[:File:Adult hearing embryonic origins.jpg\|Image - Adult hearing embryonic origins]] \| [[:File:Hearing_cartoon.jpg\|Image - without embryology]] \| [[Sensory - Hearing and Balance Development]]


	[[Category:Cartoon]] [[Category:Senses]] [[Category:Hearing]]		[[Category:Cartoon]] [[Category:Senses]] [[Category:Hearing]]