4th YEAR MBBS ENT MCQs
Ear MCQs points
¨Tympanic membrane develops from all three germ layers
¨Pinna and eustachian tube develops from 1st and 2nd pharyngeal arch
¨Number of centres from which bony
labryinth ossifies are 14
¨Tympanic membrane nerve supply is from
o
auriculotemporal
nerve,
o
auricular
branch of vagus
o
glossopharyngeal nerve
¨Stapes footplate covers oval window
¨Bone anchored hearing Aids are treatment of choice for management of single-sided deafness
¨Cochleotoxic drugs are Neomycin,Kanamycin
,Amikacin (KAN )
¨Vestibulotoxic drugs are
Streptomycin,Gentamycin ,Tobramycin
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¨Type C curve
is seen on tympanogram in Retracted tympanic
Membrane ( Eustachian tube blockage)
¨Carhart's notch is present at 2000Hz in otosclerosis
¨The pinna attains 90-95% of adult
size by 5-6 years but the ossicles attain adult size before birth
¨Sensory nerve supple of middle ear is
from glossopharyngeal nerves
¨Pinna has to be pulled upward
backward and laterally to see tympanic membrane
¨Kormer’s septum in the mastoid
separates squamous cells from the deeper petrosal cells
¨Dangerous type of CSOM is Attico
antral
¨During superficial parotidectomy, the
most reliable landmark to identify main trunk of facial
¨nerve is tympanomastoid suture
¨Endolymph is formed in scala media by
stria vascularis
¨Communication between middle ear and
eustachian tube is obliterated surgically in radial
mastoidectomy
¨Stapes superstructure develops from
reichert’s cartilage(2nd arch)
¨Interpretation of BERA is affected by
age of the child
¨Cause of SNHL due to furosemide
toxicity is oedema of stria vascularis
¨Jacobson’s nerve is other name for
tympanic branch of glossopharyngeal nerve
¨In a sitting position with head
tiltes 60° backward, lateral canal in stimulated during caloric
testing
¨Dorello’s canal transmits CN VI
abducens
¨Costen’s syndrome; otalgia,vertigo
and tinnitus (due to TM JOINT abnormality)
¨The cough response caused while cleaning the ear canal is mediated by stimulation of vagus nerve
¨Investigation of choice in assessing
hearing loss in neonates is BERA
¨Ossicular disruption with intact
tympanic membrane causes maximum hearing loss 54 dB
¨Unit of intensity while testing for
threshold of hearing in an audiogram is dB SL
¨Otoacoustic emissions are produced by
outer hair cells
¨Speech frequencies include 500 1000
2000 Hz
¨Decrease Bone conduction in an audiogram indicates damage to cochlea
¨Caloric test determines function of
lateral semicircular canal
¨On Dix-hallpike testing, nystagmus of central origin appears immediately as soon as head is in critical position without a latent period
¨In episodic positional vertigo dix
hallpike manouvere test is used
¨Ceruminous glands present in the ear
are modified apocrine glands
¨Skin over pinna is loosely attached
on medial side and tightly adherent on
lateral side
¨Dehiscence of ant wall of external auditory canal cause infection in parotid gland via fissure of santorini
