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16 Cards in this Set
- Front
- Back
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pharyngeal apparatus consists of
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pharyngeal arch x5
pharyngeal pouch x4 pharyngeal groove x4 pharyngeal membrane x4 |
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When does the pharyngeal apparatus form in development?
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week 4
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What substances drive the formation of the pharyngeal apparatus in development?
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Hox complex
retinoic acid |
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pharyngeal arch arises from
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mesoderm: muscles, arteries
neural crest cells: bone, connective tissue |
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pharyngeal pouch arises from
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endoderm
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pharyngeal groove arises from
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ectoderm
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pharyngeal membrane arises from
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endoderm
ectoderm mesoderm neural crest cells |
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The pharyngeal part of the tongue (posterior 1/3) arises from
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pharyngeal arch 2, 3, 4
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Describe the development of th tonsils
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pharyngeal arch 2, 3, 4 → copula & hypobranchial eminence → Waldeyer's ring
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Describe the development of the nasal cavity
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pharyngeal arch 1 → frontonasal prominence → ectodermal thickenings "nasal placodes" → nasal pits → nasal sacs → conchae & nasal cavity
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The external ear (auricle & external auditory meatus) arises from
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pharyngeal groove 1
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The ossicles of the middle ear arise from
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malleus - pharyngeal arch 1
incus - pharyngeal arch 1 stapes - pharyngeal arch 2 |
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The eustachian tube of the middle ear arises from
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pharyngeal pouch 1
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The tympanic membrane of the middle ear arise from
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pharyngeal membrane 1
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Describe the development of the inner ear
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ectoderm → otic placode → otic vesicle → utricules & saccules
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When does the inner ear develop?
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week 4
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