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Otic Placode and Otic Vesicle Form
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Cochlear part of otic vesicle elongates
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Mesenchyme surrounding membranous labrynth chondrifies
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Capsule adjacent to membranous labrynth undergoes vacuolization to form a cavity (perilymphatic space) around membranous labrynth and fills with perilymh
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Centres of ossification appear in remaining cartilage of otic capsule form petrous portion of temporal bone. This continues to ossify to form mastoud procoss of temporal bone.
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Vibration acoustically of maternal abdominal wall induces startle response in infants
