Sense Of Equilibrium

Question 1

Sense of equilibrium: mechanoreceptores in the inner ear also detect,

Answer 1

Rotational equilibrium = rotation of head

Gravitational equilibrium = position of head in vertical or horizontal planes.

Question 2

Rotational

Answer 2

• 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.

Question 3

Gravitational has two sacs are found in the vestibular:

Answer 3

• 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.