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Vestibular Anatomy
Aka: Vestibular Anatomy, Vestibular Labyrinth- See Also
- Anatomy: Vestibular Structures
- Semicircular canals
- Monitors head rotation and spatial positioning
- Three semicircular canals, one for each direction (X,Y and Z access)
- Otolithic organs
- Utricle
- Contains otoliths (small stones) that settle with position changes
- Detects horizontal linear movement and Head Tilting
- Sacule
- Smaller, more globular organ without utricle communication
- Detects vertical linear movement (e.g. gravity)
- Utricle
- Semicircular canals
- Anatomy: Neurologic Structures
- Cranial Nerve VIII (2 tracts)
- Vestibular nucleii
- Located in the pons and Medulla and receive input from the respective tracts of Cranial Nerve VIII
- Transmit signals to the rest of the Cerebrum, Cerebellum and spinal cord to combine with other inputs (e.g. occiptal lobe, dorsal columns)
- Medial Longitudinal Fasciculus and Oculomotor Nucleus
- Anatomy: Vascular Structures
- See Vertebro-Basilar CVA
- Posterior Circulation via the vertebrobasilar system
- Vertebral arteries
- Two arteries ascend in parallel from the subclavian artery via each transverse foramen and join to form the Basilar Artery
- Branches
- Basilar Artery
- Arises from the joining of the two Vertebral arteries and coursing anteriorly to join with the Anterior Circulation via the Circle of Willis
- Branches
- Anatomy: Images
Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
- References
- Ondrejka (2014) Crit Dec Emerg Med 28(10): 11-7