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Vestibular Apparatus Consists of

  1. Semicircular canals
  2. Utricle
  3. Saccule

The receptor structure of the semicircular canals is the crista ampullaris in the ampulla. Each crista has hair cells and sustentacular cells surmounted by a gelatinous partition (cupula) that closes off the ampula. The utricle and saccule have otoliti organ or macula. The macula has hair cells surmounted by an stolithic membrane in which are embedded crystals of calcium carbonate (otoliths).

Position of macula in utricle and saccule:

  • In utricle: Floor of the utricle
  • In saccule: wall of the saccule in a semi vertical position.

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