Ch7 - Vestibular Flashcards
1
Q
Vestibular system
A
Vestibular sac (orientation), Semicircular canals (movement)
2
Q
Vestibular sacs
A
utricle (little pouch) & saccule (little sack)
Cilia of hair cells of receptive tissue of organs are embedded in gelatinous mass which contains otoconia (calcium carbonate crystals that shift gelatinous mass with gravity)
3
Q
Semicircular canals
A
Endolymph - fluid membranous canal floating within a bony one
Receptive organs: cupula (section of ampulla (before cochlea)) contains hair cells activated by push-pull mechanisms & go to axons of ampullary nerve
4
Q
Vesibular pathway
A
Vestibular nerves - ganglion
most axons of vestibular nerve synapse within vestibular nuclei in the medulla
Some axons travel directly to cerebellum
Responsible for dizziness
