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

Revision as of 08:49, 9 May 2012

Many different embryonic components contribute to the sensory structures required for hearing.

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 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 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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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.
+===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)