Quiz 10 - Ear

Question 1

oval window

Answer 1

filled by base of stapes; hole that connects to inner ear

Question 2

round window

Answer 2

inferior to oval window; flexible membrane separating perilymph (fluid) in cochlea from middle ear

Question 3

tensor tympani and stapedius

Answer 3

skeletal muscles that dampen large vibrations to prevent damage in cochlea

Question 4

middle ear

Answer 4

auditory tube
auditory ossicles
oval window
round window
tensor tympani and stapedius

Question 5

inner ear

Answer 5

bony labyrinth

membranous labyrinth

Question 6

bony labyrinth

Answer 6

shell of defense bone that surrounds and protects the membranous labyrinth

Question 7

membranous labyrinth

Answer 7

collection of fluid-filled tubes and chambers

• perilymph
• endolymph

Question 8

perilymph

Answer 8

fills membranous labyrinth

Question 9

endolymph

Answer 9

surrounds membranous labyrinth

Question 10

vestibular system

Answer 10

maintains our orientation and balance in space (equilibrium)

Question 11

vestibular apparatus

Answer 11

filled with endolymph consisting of:

• utricle and saccule
• semicircular canals

Question 12

semicircular canals

Answer 12

analyzes rotational movement in 3 planes

• lateral (shaking head “no” - horizontal plane)
• anterior (shaking head “yes” - vertical plane)
• posterior (tilting head from side to side - lateral plane)

Question 13

ampulla

Answer 13

contains cupola and hair cell receptors that responds to rotational movement

Question 14

cupula

Answer 14

gel-like structure where hair cells are embedded

Question 15

hair cells (mechanoreceptors)

Answer 15

receptors for detecting equilibrium

Question 16

kinocilium and sterocilia

Answer 16

hair-like extensions contained in hair cells (when bent, hair cells depolarize and release neurotransmitters that stimulate nerve)

Question 17

detection of linear acceleration

Answer 17

macula and otolith

Question 18

macula

Answer 18

contain hair cell receptors to detect linear acceleration; located in utricle and saccule

Question 19

otolith

Answer 19

jelly-like mass with tiny calcium carbonate crystals were hair cells are embedded

Question 20

utricle

Answer 20

macula sensitive to horizontal acceleration (car)

Question 21

saccule

Answer 21

macula sensitive to vertical acceleration (elevator)

Question 22

coclea

Answer 22

“snail” - spiral shaped bony chamber containing cochlear duct (containing mechanoreceptors for hearing)

Question 23

cochlear duct

Answer 23

lies between 3 perilymph-filled chambers: houses organ of Corti

Question 24

vestibular duct

Answer 24

(filled w/ perilymph): form oval window (base) to tip of spiral (apex); superior to cochlear duct

Question 25

vestibular membrane

Answer 25

forms "roof" of cochlear duct

Question 26

tympanic duct

Answer 26

(filled w/ perilymph): from tip of spiral (apex) to round window, inferior to cochlear duct

Question 27

organ of corti

Answer 27

contains hair cell receptors that rests on basilar membrane of cochlear duct

Question 28

tectorial hembrane

Answer 28

lie on top of hair cells

Question 29

organ of corti

Answer 29

contains hair receptors that rests on basilar membrane of cochlear duct

Question 30

tectorial membane

Answer 30

lie on top of hair cells (forms "tent")

Question 31

sterocilia and kinocilium

Answer 31

bending cilia mechanically gated ion channels (mechanoreceptors), causing depolarization and releasing neurotransmitters, leading to cochlear fibers to fire action potential