Sense Of Equilibrium Flashcards
1
Q
Sense of equilibrium: mechanoreceptores in the inner ear also detect,
A
Rotational equilibrium = rotation of head
Gravitational equilibrium = position of head in vertical or horizontal planes.
2
Q
Rotational
A
- Three semicircular canals has enlarged base called ampulla.
- Each ampulla contains hair cells with sterecilia embedded in gelatinous, bulb like cupula.
- as fluid canal flows and bends acupula inside the ampulla, the sterocilia are bent.
- impulses are carried by vestibular nerve to the brain stem and cerebellum.
3
Q
Gravitational has two sacs are found in the vestibular:
A
- utricle: sensitive to horizontal movement of head.
- saccule: sensitive to vertical movement of head.
- both contain hair cells with stereocilia embedded in an otolithic membrane.
- calcium carbonate granules( otoliths) rest on the otolithic membrane. When this moves bent the stereocilia.