40 Organ of Cortis位在下列那一種結構上？

 蝸孔（helicotrema） 基底膜（basilar membrane）

前庭膜（Reissner’s membrane） 覆膜（tectorial membrane）

BASILAR membrane

note this picture: one of their favorite questions:

the last one is about hair cells: outside 3 and inside 1