4 MCQs in Physiology for NEET PG
Which cranial nerve carries vestibular afferent fibers from the semicircular canals and otolith organs to the vestibular nuclei in the medulla?
A 52-year-old man presents with sudden onset severe vertigo, nausea, and vomiting that began 6 hours ago while he was lying in bed. On examination, he has spontaneous nystagmus with the fast phase beating to the right, and positive Dix–Hallpike maneuver reproducing his symptoms. Romberg test is normal, and gait is not ataxic. Hearing is intact bilaterally. What is the most likely diagnosis?
A 38-year-old woman with a 3-year history of recurrent episodes of vertigo, fluctuating low-frequency hearing loss, tinnitus, and aural fullness in the right ear presents with acute worsening. During the current episode, she has severe vertigo with spontaneous nystagmus (fast phase to the left), nausea, and vomiting lasting 4 hours. Caloric testing shows reduced vestibular response on the right. Audiometry confirms sensorineural hearing loss at 250–1000 Hz on the right. What is the most likely diagnosis?
Which of the following structures within the membranous labyrinth is responsible for detecting linear acceleration and gravity?
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