Question

$9th$ pair of cranial nerve in frog is :

• A. hypoglossal
• B. glossopharyngeal
• C. vagus
• D. trigeminal

Answer 1

The Correct Option is B

In frog $IX$ pair of cranial nerve is glossopharyngeal, while trigeminal is Vth pair and vagus is $X$ pair of cranial nerves, Hypoglossal is absent in frogs, it is commonly found in rabbit.

Answer 2

Explanation:-

Cranial nerves are the 12 nerves that arise from the back of the brain. In frogs, the IX pair of cranial nerves is the glossopharyngeal nerve, a mixed nerve consisting of both motor and sensory fibers that arise from its nuclei. 

• The glossopharyngeal nerve processes sensory information from the back of the tongue, pharynx, and other areas and controls specific throat muscles.
• The trigeminal nerve, the Vth pair of cranial nerves, is responsible for facial and scalp sensations and is the largest cranial nerve. 
• The hypoglossal nerve, the 12th cranial nerve, plays a role in speech, swallowing, and chewing. Notably, the Hypoglossal nerve is absent in frogs but present in rabbits.
• The Vagus nerve, the Xth cranial nerve, originates in the brainstem and extends through the neck and into the chest and abdomen. It plays a crucial role in regulating body functions such as heart rate, blood pressure, breathing, and digestion.

Therefore, the 9th pair of cranial nerves in frogs is Glossopharyngeal, Hence option (B) is correct.