Exam 3 (Chapter 19) - Auditory System Flashcards
Which middle ear ossicle attaches to the tympanic membrane?
Malleus
True or False: Middle ear infection could affect the facial nerve.
True
Which nerve innervates the tensor tympani?
Trigeminal nerve
Where is the organ of Corti located?
Cochlear duct
Which two cranial nerves innervate the middle ear muscles (stapedius and tensor tympani)?
Trigeminal (V)
Facial (VII)
Which statement is correct about the auditory system?
The acoustic startle reflex is mediated by the medial tectospinal tract.
What is complete hearing loss in the left ear most likely induced by?
Left cochlear nuclei
The cochlear duct is filled with ________ and scala tympani with _________.
endolymph; perilymph
Where are cell bodies of the cochlear nerve located?
In the spiral ganglion
Which structure is not a part of the auditory system?
Lateral geniculate nucleus
Higher frequency sound is detected by sensory hair cells of the organ of Corti located closer to the _________.
Base of the basilar membrane
True or False: Stereocilia of sensory hair cells have mechanically-gated K+ channels.
True
What is not true when considering the middle ear reflex?
It protects the tympanic membrane from loud noises. (It doesn’t)
Which structure is not correctly paired with its function?
Acoustic stria; plays a key role in sound localization. (It doesn’t)
A dog shakes its head and its right eye fails to close (no blinking). Otoscopic examination of the right ear shows a lesion of the tympanic membrane and pus from the middle ear. If the condition is not treated properly, what could the dog develop?
Keratitis
