Chapter 9 - Anatomy of Ear

Question 1

Lined with Membranous Labyrinth, contains Fluid

Answer 1

Bony Labyrinth

Question 2

Semicircular Canals and
Vestibule

Answer 2

Used for Equilibrium

Question 3

Contains Spiral Organ where Sensory Receptors are Located

Answer 3

Cochlea

Question 4

Pathway Of Sound

Answer 4

1. Sound Vibrations hit Tympanic Membrane
2. Auditory Ossicles (bones) Vibrate
3. Vibrations Transmit to Inner Ear
4. Perilymph Fluid inside Cochlea Vibrates
5. Sterocilia on Hair Cells (mechanoreceptors inside spiral
   organ of cochlea) Bend
6. Nerve Impulse from Hair Cells → Brain (auditory area of
   cerebrum)

Question 5

Different Portions of Spiral Organ Respond to Different Pitches

Answer 5

Pitch

Question 6

Louder Sound → More Pressure → Faster Vibrations

Answer 6

Volume

Question 7

Rotational Equilibrium

Answer 7

• Three Semicircle Canals
• Three Directions
• Respond to Fluid Movement

Question 8

Gravitational Equilibrium

Answer 8

• Structure in Vestibule
• Sensitive to Verticle & Horizontal Movement
• Respond to Fluid Movement