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NURS319 Exam 2 - EARS With 100% Correct Answers
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NURS319 Exam 2 - EARS With 100% Correct Answerswhat is the external ear
sensory organ for hearing and maintaining equilibrium
Name for the external ear?
auricle or pinna
what does the external ear consist of?
movable cartilage and skin
external auditory canal
funnels sound waves into the external ears opening
description of auditory canal
cul-de-sac 2.5 to 3 cm long in adults that terminates at eardrum, or tympanic membrane
what is the auditory canal lined with?
ceruminous glands produce cerumen - a yellow wax-like material that lubricates and
protects ear
to where does lymphatic drainage of the external ear flow?
drains to parotid, mastoid and superficial cervical nodes
location of the tympanic membrane - eardrum
part of external ear
separate external and middle ear
describtion
obliquely tilted towards the canal of the ear
tympanic membrane - eardrum characteristics
slightly concave, somewhat translucent, pearly grey with prominent light reflex in the
antero-inferior quandrant
what is the middle ear?
, small cavity air-filled inside temporal bone
what are the contents of middle ear?
small bones in the ear or auditory ossicles: malleus, incus and stapes
what is the passage within the middle ear?
eustachian tube
what is the eustachian tube?
opening connecting middle ear with nasopharynx and allowing passage of air
normally closed but opens on swallowing or yawning
functions of middle ear
transmit sound vibrations from outer ear to central apparatus for hearing in inner ear
dampens loud noises to protect inner ear by dampening its amplitude
eustachian tube allows equalization of air pressure on each side of TM so it does not
rupture
what is the inner ear?
contains bony labyrinth which holds sensory organs for equilibrium and hearing
what does the inner ear contain?
vestibule and semicircular canals (vestibular apparatus) and cochlea (central hearing
apparatus)
what does the labyrinth in the inner ear do?
continually sends information to brain about position of body in space
three semicircular canals
if becomes inflamed, wrong information sent to brain creating a staggering gait and
vertigo
division of auditory system
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