12vestibular_2009

12vestibular_2009 - The Labyrinth and Its Innervation (five...

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The Labyrinth and Its Innervation (five organs in one!) Two: Otolith organs (the utricle and the sacculus ) Three: Semicircular canals, the superior (or anterior), posterior , and the horizontal (or lateral)
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The internal auditory meatus (IAM) is open to the posterior cranial fossa and contains the superior division (sd) of the eighth cranial nerve. The utricular macula (mu), one of two gravity receptors, is visible in the center, along with cuts through the non- sensory portions of the lateral (lsc), posterior (psc) and superior (ssc) semicircular canals.* (do not memorize)
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Polarization maps of organs, morphological polarization of hair cells Ampullae ( bulge in semicircular canals ) Within a single crista , all hair cells have the same polarity Sacculus and Utricule Hair cell polarity varies with position in the macula to sample all directions of motion. maculae cristae
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Hair cell from the bullfrog sacculus Kinocilium Otoconia The size of the otoconia vary regionally from 3 to 30 µm in both the utricle and sacculus.
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12vestibular_2009 - The Labyrinth and Its Innervation (five...

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