Answered

44. All of the following statements accurately describe functions of the
glossopharyngeal nerves (IX) except
a. Its motor fibers innervate the stylopharyngeus muscle to elevate the
pharynx and larynx during swallowing.
b. Its motor fibers innervate the parotid gland to stimulate saliva
secretion.
c. Its sensory fibers transmit signals for touch, temperature, and
pressure, but not taste, to the anterior portion of the tongue.
d. Its sensory fibers transmit signals for touch and taste to the medulla
oblongata, somatosensory cortex, and gustatory cortex.
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Answer :

GinnyAnswer
The correct answer is:

b. Its motor fibers innervate the parotid gland to stimulate saliva secretion.

Explanation:
1. The glossopharyngeal nerve (IX) has motor fibers that do not innervate the parotid gland to stimulate saliva secretion. This function is actually carried out by the parasympathetic fibers of the glossopharyngeal nerve, which synapse in the otic ganglion and then reach the parotid gland.
2. The motor fibers of the glossopharyngeal nerve do innervate the stylopharyngeus muscle to elevate the pharynx and larynx during swallowing, as stated in option a.
3. The sensory fibers of the glossopharyngeal nerve transmit signals for touch, temperature, and pressure to the anterior portion of the tongue, but not taste, as mentioned in option c.
4. The sensory fibers of the glossopharyngeal nerve also transmit signals for touch and taste to the medulla oblongata, somatosensory cortex, and gustatory cortex, as stated in option d.

Therefore, options a, c, and d accurately describe functions of the glossopharyngeal nerve, while option b does not.

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