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

From Embryology
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* '''External Auditory Meatus''' - Pharyngeal Arch 1 groove or cleft (ectoderm)
* '''External Auditory Meatus''' - Pharyngeal Arch 1 groove or cleft (ectoderm)
* '''Tympanic Membrane''' - Pharyngeal Arch 1 membrane (ectoderm, mesoderm, endoderm)
* '''Tympanic Membrane''' - Pharyngeal Arch 1 membrane (ectoderm, mesoderm, endoderm)
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===Middle Ear===
===Middle Ear===
* '''Middle Ear Ossicles'''
* '''Middle Ear Ossicles'''
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* '''Middle Ear Cavity'''
* '''Middle Ear Cavity'''
** Pharyngeal Arch 1 pouch (endoderm)
** Pharyngeal Arch 1 pouch (endoderm)
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===Inner Ear===
===Inner Ear===
* '''Inner Ear Labyrinth'''
* '''Inner Ear Labyrinth'''

Revision as of 10:33, 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)


Related images: Image - Adult hearing embryonic origins | Image - without embryology

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