Question

multiple select question
select all that apply
identify all the cranial nerves associated with gastrointestinal tract motor output.
vagus
hypoglossal
trochlear
facial
olfactory
glossopharyngeal

Explanation:

• The vagus nerve (cranial nerve X) is a major contributor to the parasympathetic innervation of the gastrointestinal tract, regulating motor functions such as peristalsis.
• The glossopharyngeal nerve (cranial nerve IX) also has some minor contributions to the motor output related to the upper gastrointestinal tract (e.g., in swallowing reflexes that involve parts of the pharynx which is adjacent to the upper digestive tract).
• The hypoglossal nerve (cranial nerve XII) is mainly involved in tongue movement (for speech and swallowing - but more in the oral phase of swallowing rather than direct gastrointestinal tract motor output).
• The trochlear nerve (cranial nerve IV) is involved in eye movement.
• The facial nerve (cranial nerve VII) is mainly for facial expression, taste (anterior 2/3 of tongue), and salivary gland secretion (not direct motor output for the gastrointestinal tract's smooth muscle - which is the main motor aspect of the tract).
• The olfactory nerve (cranial nerve I) is for the sense of smell.

Answer:

vagus, glossopharyngeal