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WorksheetsAnatomy of EAR
Total questions: 15
Worksheet time: 8mins
Regarding the external auditory canal (EAC) which is correct statement
The lateral one-third is cartilaginous and lined with ceruminous glands
The medial two-thirds is cartilaginous and has hair follicles
The fissures of Santorini are present in the bony canal
The skin of the cartilaginous canal is tightly adherent to the underlying cartilage
Which structure contributes most to impedance matching in the middle ear?
Lever action of ossicles
Buckling effect of tympanic membrane
Area difference between tympanic membrane and stapes footplate
Round window compliance
The stapedius muscle is innervated by:
Mandibular nerve
Facial nerve
Glossopharyngeal nerve
Cochlear nerve
Which part of the cochlea is most sensitive to high-frequency sounds?
Apical turn
Middle turn
Basal turn
Helicotrema
Endolymph is characterized by:
High Na+, low K+ concentration
High K+, low Na+ concentration
Equal K+ and Na+ concentration
High Ca2+ and low Cl– concentration
The primary generator of the endocochlear potential is:
Inner hair cells
Stria vascularis
Spiral ganglion
Tectorial membrane
The afferent innervation of cochlear hair cells is such that:
90% of fibers synapse with outer hair cells
90% of fibers synapse with inner hair cells
Outer hair cells have Type I afferents predominantly
Inner hair cells have Type II afferents predominantly
Which reflex helps protect the cochlea from loud sounds?
Acoustic reflex
Oculovestibular reflex
Startle reflex
Cochlear microphonic reflex
In otoacoustic emissions, the sound is generated by:
Inner hair cells via neurotransmitter release
Outer hair cells due to motility
Middle ear ossicles vibrating in reverse
Tectorial membrane shearing
The blood supply of the cochlea is primarily derived from:
Middle meningeal artery
Labyrinthine artery, branch of AICA
Ascending pharyngeal artery
Stylomastoid branch of posterior auricular artery
The phenomenon of recruitment in sensorineural hearing loss is due to:
Loss of outer hair cells with preserved inner hair cell function
Dysfunction of the stria vascularis
Ossicular discontinuity
Abnormal stapedius reflex
Which nucleus of the auditory pathway is the first to receive bilateral inputs?
Cochlear nucleus
Superior olivary complex
Inferior colliculus
Medial geniculate body
The helicotrema of the cochlea:
Separates scala tympani from scala media
Allows communication between scala vestibuli and scala tympani
Is the site of maximum sensitivity to high frequencies
Contains the stria vascularis
The resonance frequency of the external auditory canal in adults is approximately:
500 Hz
1 kHz
2–4 kHz
8 kHz
The motor innervation of tensor tympani and stapedius is via:
Mandibular nerve and glossopharyngeal nerve
Mandibular nerve and facial nerve
Maxillary nerve and facial nerve
Trigeminal nerve and vagus nerve
