Pathways for parasympathetic fibers innervating the digestive system include:
a. pelvic nerves from sacral spinal cord segments s2-s4
b. the vagus nerve (cn x)
c. cranial nerves vii (facial) and ix (glossopharyngeal) to the salivary glands
d. all of the above

D) All of the above.

Explanation:

 The pathway for the parasympathetic fibers innervating the digestive system including all the given options as, the parasympathetic is the nervous system which conserved energy as it slowed the rate of heart and increased the activity of the gland. Basically, it deal with system of gastrointestinal tract and can controlled the cranial nerves.

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