ヒト胎児前庭器の発生

概要

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Embryonic development of human vestibules and semicircular canals was studied morphologically by scanning electron microscopy. The inner ears of eight fetuses, 7 to 23 weeks of age, were obtained for this study with the permission of their families.1. Sensory hair development progressed from the striola toward the periphery on the macula, and from the top toward the periphery on the crista ampullaris.2. Intermingled coexistence of immature and mature sensory hairs over the sensory epithelium of the vestibular organs was seen in the specimens from 12- to 17-week-old fetuses.3. Back scattered electron image observation revealed that type I and type II sensory cells could be differentiated in fetuses over 20 weeks of age.4. Non-sensory ciliated cell groups were found in 4 fetuses aged 12- to 20-weeks. These cells were scattered in boundary areas between the three semicircular canal ampullae and the utricle.5. Atypical sensory hairs and crista neglecta were found in 16-week-old futuses.