Question

Impairment of Glossopharyngeal nerve will most probably NOT affect ............

• A. rotation of eyeball
• B. swallowing secretion
• C. saliva secretion
• D. sense of taste

Hint:

The Glossopharyngeal nerve is primarily responsible for taste, salivation, and swallowing, but does not control eye movements.

Answer 1

The Correct Option is A

Step 1: Understanding the Glossopharyngeal nerve.
The Glossopharyngeal nerve (Cranial nerve IX) plays a role in taste, saliva secretion, and swallowing. It affects taste sensation on the posterior third of the tongue and stimulates the parotid salivary gland.
Step 2: Analyzing the options.
(A) rotation of eyeball: Correct — The Glossopharyngeal nerve does not control eye movement, which is primarily regulated by the oculomotor, trochlear, and abducens nerves.
(B) swallowing secretion: The Glossopharyngeal nerve does contribute to swallowing and saliva secretion, particularly from the parotid gland.
(C) saliva secretion: The Glossopharyngeal nerve is involved in saliva secretion from the parotid gland.
(D) sense of taste: The Glossopharyngeal nerve is responsible for the sense of taste on the posterior third of the tongue.
Step 3: Conclusion.
The correct answer is (A) rotation of eyeball, as the Glossopharyngeal nerve does not affect eye movements.