EARS

Question 1

masses of lymphatic tissue in the pharyngeal cavity
filter and protect the respiratory and alimentary tract from pathogenic organisms
play a role in the formation of antibodies protecting against URIs
larger in children than adults and start to atrophy at age 12

Answer 1

Tonsils

Question 2

How many primary teeth are there and what age do they start to erupt

Answer 2

20

start erupting at age 6 months

Question 3

What age do permanent teeth erupt? Wisdom teeth?

Answer 3

6-13 years old

wisdom teeth at ages 17-21

Question 4

What teeth are the first to erupt

Answer 4

Incisors
lower central and then upper
lower lateral incisors and then upper lateral incisors

Question 5

Malleus

Answer 5

in the inner ear
lies on the tympanic membrane
vibrates with sound

Question 6

Incus

Answer 6

bridges malleus and stapes

Question 7

stapes

Answer 7

rests against oval window

stimulates fluid of inner ear

Question 8

What separates the external ear from middle ear?

Answer 8

Tympanic membrane

Question 9

What does the Eustachian tube do?

Answer 9

ventilates middle ear
equalizes internal air pressure and atmospheric pressure
replaces absorbed oxygen
protects ear from sound, pressure and secretions
drains secretions from middle ear into the nasopharynx

Question 10

What does the inner ear do?

Answer 10

TRANSMIT SOUNDS
fluids move according to the vibrations of the TM, ossicles, and oval window
fluid sound waves reach the cochlea
sounds is transduced by hairs in the organ of Corti
impulses are sent by the hair cells to cranial nerve VIII
impulses continue to the brain
AIDS BALANCE
equilibrium receptors are located in the semicircular canals and vestibule of the inner ear
RESPONDS TO CHANGES IN DIRECTION OF MOVEMENT
MAINTAINS EQUILIBRIUM