Destruction of right labyrinth causes nystagmus to:
**Core Concept**
The destruction of the right labyrinth leads to a disruption in the vestibular-ocular reflex, causing nystagmus. The vestibular-ocular reflex is a complex response that involves the vestibular apparatus in the inner ear, the vestibular nuclei in the brainstem, and the extraocular muscles. This reflex helps to stabilize images on the retina during head movements.
**Why the Correct Answer is Right**
When the right labyrinth is destroyed, the patient experiences a loss of vestibular input from that side. This loss of input disrupts the vestibular-ocular reflex, leading to an abnormal eye movement known as nystagmus. The direction of nystagmus is determined by the affected side of the labyrinth; in this case, it would be **towards the right** because the left vestibular system is intact and tries to compensate for the loss of vestibular input from the right side.
**Why Each Wrong Option is Incorrect**
* **Option A:** Nystagmus is not typically associated with the destruction of the labyrinth, but rather with the disruption of the vestibular-ocular reflex. This option is incorrect because it is a vague and non-specific choice.
* **Option B:** This option is incorrect because the direction of nystagmus is determined by the affected side of the labyrinth, not the unaffected side.
* **Option C:** This option is incorrect because the direction of nystagmus is determined by the affected side of the labyrinth, not the direction of gaze.
**Clinical Pearl / High-Yield Fact**
When assessing a patient with suspected labyrinthine damage, it's essential to note the direction of nystagmus, as this can help localize the lesion to the affected labyrinth.
**Correct Answer: C. towards the right**