At the 0th day of incubation,the presumptive utricle projected to produce presumptive saccule and primordia of anterior, posterior and lateral ampulla.
At the 0th day of incubation,the presumptive utricle projected to produce presumptive saccule and primordia of anterior, posterior and lateral ampulla.
第0天出现球囊与椭圆囊部的分化，椭圆囊部出现前、后、侧壶腹原基；