Question

the cranial nerve that emerges from the pons and serves the motor and proprioceptive functions of the eyeball is the _________. a) glossopharyngeal b) abducens c) hypoglossal d) vagus

Explanation:

• The glossopharyngeal nerve (A) is mainly related to taste, swallowing, and salivation in the pharynx and tongue area, not the eyeball.
• The abducens nerve (B) emerges from the pons. Its motor function is to innervate the lateral rectus muscle of the eyeball, which is responsible for the abduction (lateral movement) of the eyeball. It also has proprioceptive functions related to the eyeball's position and movement.
• The hypoglossal nerve (C) controls the muscles of the tongue, not the eyeball.
• The vagus nerve (D) is involved in many functions such as regulating the heart rate, digestive system, etc., not the motor and proprioceptive functions of the eyeball.

Answer:

B. abducens