$.....P.....$ ends at the oval window,while $.....Q.....$ ends at the round window,which opens to the middle ear.
$\quad\quad\quad P\quad\quad \quad Q$

  • A
    Scala tympani $\quad$ $\quad$ Scala vestibuli
  • B
    Scala vestibuli $\quad$ $\quad$ Scala tympani
  • C
    Scala vestibuli $\quad$ $\quad$ Scala media
  • D
    Scala media $\quad$ $\quad$ Scala vestibuli

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