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

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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).

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)

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

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 ==Adult Hearing Embryonic Origins==
-Many different embryonic components contribute to the sensory structures required for hearing.
+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).
 ===External Ear===
 * '''Auricle''' - Pharyngeal Arches 1 and 2 (ectoderm, mesoderm)