Inner ear

Question 1

Perilymph

Answer 1

Fluid in the perilymphatic space of the inner ear, produced by filtration, thus its composition is the same as that of other extracellular fluids.

Question 2

Endolymph

Answer 2

Fluid in the membranous labryrinth of the inner ear, produced by secretion, characterized by high K+ levels.

Question 3

Hair cell

Answer 3

Secondary sensory cell in the inner ear.

Question 4

Stereocilium

Answer 4

Processes on the apical surface of the hair cells filled with actin filaments and bearing mechanosensitive K+ channels at the tip.

Question 5

Kinocilium

Answer 5

Long process on the apical surface of the hair cells showing cilium structure in cross secction.

Question 6

Tip link

Answer 6

Protein structure connecting the tips of the stereocilia; important for the deformation of the membrane and thus for the opening of the K+ channels during bending of the stereocilia.

Question 7

Organ of Corti

Answer 7

The organ of hearing in the inner ear.

Question 8

Fenestra rotunda

Answer 8

Membrane covered opening between the cochlea and the middle ear, it lets the perilymph move when the stapes pushes the membrane at the fenestra ovale.

Question 9

Fenestra ovale

Answer 9

Membrane covered opening between the cochlea and the middle ear.