Anatomy & Histology · single question
Which of the following cranial nerves is NOT involved in the process of swallowing (deglutition)? (EXCEPT)
Show answer and explanation
Correct answer: C. CN XI (Spinal Accessory)
Swallowing (deglutition) involves CN V (jaw muscles, tensor veli palatini), CN VII (buccinators, facial muscles), CN IX (stylopharyngeus, sensory pharynx), CN X (vagus — pharyngeal/laryngeal muscles, esophagus), CN XII (hypoglossal — tongue muscles). CN XI (Spinal Accessory) innervates the sternocleidomastoid and trapezius — it plays NO role in swallowing. CN XI is the exception.
- A. Incorrect (CN V IS involved). CN V (trigeminal) innervates muscles of mastication and tensor veli palatini, contributing to the oral preparatory phase of swallowing.
- B. Incorrect (CN VII IS involved). CN VII (facial) innervates the buccinator and lip muscles, important for keeping food in the oral cavity during the oral phase.
- C. CORRECT. CN XI (Spinal Accessory) innervates the SCM and trapezius — it has NO role in swallowing.
- D. Incorrect (CN IX IS involved). CN IX (glossopharyngeal) innervates the stylopharyngeus and provides sensory input to the posterior oropharynx, triggering the swallowing reflex.
Practice Anatomy & Histology questions Anatomy & Histology study notes