vestibular system Flashcards
kinocilia and action potentials
toward kinocilia - more APs
away from kinocilia - less APs
hair cells at the base of semicircular canals are on:
cristae
what are otoliths?
carbonate crystals in the gel surrounding hair cells of the macula of the utricle and saccule and allow hair cells to respond to gravity
what does the macula detect?
linear acceleration or position
cristae respond to:
angular acceleration
where are the cell bodies of CN VIII
vestibular ganglion
first order fibers from the vestibular ganglion project to:
- vestibular nuclear complex
- flocculus and nodulus of cerebellum
where is the vestibular nuclear complex and what are its components?
- medulla-pons junction in dorsolateral portion of brainstem
- lateral, medial, superior vestibular nuclei
information arrives at the vestibular nuclear complex from several locations….
- vestibular ganglion
- flocculus of cerebellum
- spinal cord (proprioception)
where do vestibular efferents leave from?
vestibular nuclear complex
where do vestibular efferents project to?
- nuclei of CN III, IV, VI
- paramedian pontine reticular formation (PPRF)
where does decussation occur in the vestibular system?
medial longitudinal fasciculus
outline the connections of the vestibular system
CN VIII - vestibular ganglion - vestibular nuclear complex/flocculus - CN VI and PPRF - MLF - CN III and IV
