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21 Cards in this Set
- Front
- Back
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What does the otic placode give rise to? |
inner ear |
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What gives rise to the membranous labyrinth? |
Ectoderm |
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What gives rise to the bony labyrinth? |
mesenchyme |
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What gives rise to the otic placode? |
surface ectoderm |
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Otic placode invaginates to form the? |
Otic pit |
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When the otic pit edges fuse, what results? |
otocyst or otic vessicle |
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Where does the organ of Corti derive from? |
cells along the wall of the cochlear duct |
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How are the semicircular ducts formed? |
tissue loss |
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What gives rise to the spinal and vestibular ganglia and corresponding sensory nerves? |
neuroectoderm |
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Otic capusle |
mesoderm around otocyst |
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How does perilymph and corresponding stuctures form? |
vacuoles containing the perilymph develop within capsule vacuoles enlarge and unite to form the perilymphatic space divides into the scale typmani and the scala vestibuli cartilage ossifies to form the bony labyrinth |
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Order in which hair cells develop? |
Inner first and then outer from neuro epithelial cells |
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What arises from 1st PA pouch endoderm? |
Lining of the middle ear Eustachian tube |
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What arises from 1st PA cartilage? |
head of malleus, body and short process of incus NC |
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What arises from 2nd PA cartilage? |
long process of malleus, long process incus, stapes NC |
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What gives rise to the external acoustic canal? |
surface ectoderm |
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What is the function of the meatal plug? |
source of growth to change shape and size of EAC to meet with ear drum |
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What gives rise to the tympanic membrane? |
inner layer endoderm middle layer mesoderm outer layer ectoderm |
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What gives rise to the auricle? |
hillocks (mesoderm) |
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Congential causes of deafness? |
congenital fixation of stapes rubella defects in planar cell polarity signaling |
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Auricle defects signifigance? |
often associate with other developmental defects due to the common cellular ancestry from pharyngeal arches (facial muscles, hearing, nerves or vasculature) |
