Final answer:
The majority of preganglionic fibers of the parasympathetic nervous system arise from the vagus nerve, which is responsible for innervating organs in the thoracic and abdominal cavities and influences functions like heart rate and digestion.option c is correct
Step-by-step explanation:
Among the cranial nerves, the vagus nerve (cranial nerve X) contains the majority of preganglionic fibers of the parasympathetic nervous system. The vagus nerve innervates multiple organs in the thoracic and abdominal cavities including the heart, lungs, and digestive organs. While the oculomotor (cranial nerve III), facial (cranial nerve VII), and glossopharyngeal (cranial nerve IX) nerves also contain parasympathetic fibers, the vagus nerve is responsible for a large portion of parasympathetic outflow throughout the body, making option C) Vagus the correct answer to the question.
It is involved in various functions such as reducing the heart rate and stimulating digestive activities.The majority of preganglionic fibers of the parasympathetic nervous system arise from the vagus nerve, which is responsible for innervating organs in the thoracic and abdominal cavities and influences functions like heart rate and digestion.