Initial stage of fetal development of the pharyngotympanic tube cartilage with special reference to muscle attachments to the tube
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Fetal development of the cartilage of the pharyngotympanic tube (PTT) is characterized by its late start. We examined semiserial histological sections of 20 human fetuses at 14-18 weeks of gestation. As controls, we also observed sections of 5 large fetuses at... ...
