The Dix-Hallpike Test with the Left Ear Down Elicits a Transient

question 2

Multiple Choice

The Dix-Hallpike test with the left ear down elicits a transient up-beating nystagmus with a left torsion.What is the location and mechanism of benign paroxysmal positional vertigo?

• A)Left posterior semicircular canal cupulolithiasis
• B)Left superior semicircular canal canalithiasis
• C)Left superior semicircular canal cupulolithiasis
• D)Left posterior semicircular canal canalithiasis

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Definitions:

Retinal Bipolar Cells

These are types of neurons found in the retina, performing the role of transmitting signals from photoreceptors (rods and cones) to ganglion cells.

Ganglion Cells

Neurons located in the retina of the eye that receive visual information from photoreceptors via bipolar cells and transmit it to the brain through the optic nerve.

Lateral Geniculate Cells

Neurons located in the lateral geniculate nucleus of the thalamus, playing a critical role in the processing and relay of visual information from the retina to the visual cortex.

Thalamus

A structure in the brain that acts as a relay center, processing and transmitting sensory information to the appropriate areas of the cortex.