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Vestibular System (Stimulus (Linear acceleration (Forwards and backwards,…

- - - - Senses vertical movement
    - - senses Horizontal movement
    - - Otolith Organs
        
        Senses linear acceleration
        
        Haircells
        
        Excitation is generated through gravity
        
        Cells are linked to calcium rocks in the ear
        
        Head moves in one direction, Rocks FOLLOW the direction of movement
        
        Head bending backward causes Depolarisation
        
        Head tilting forward causes hyperpolarisation
      - Semicircular organs
        
        Canals
        
        Filled with endolymph
        
        Does not flow past the Cupula
        
        Cupula
        
        Ampulla
        
        Area in which contains the haircells and the cupula
        
        Hair cells
        
        Extend through the crista into the cupula
        
        Crista
        
        Functions
        
        Inertia of endolymph produce across the cupula
        
        Hair cells moves in the OPPOSITE direction
        
        Cupula is distorted through the movements of the endolymph
        
        Excitation similar to that of otholith except
        
        Works in pairs
        
        Rotation
        
        Depolarisation on one side
        
        Hyperpolarisation on the oter