Cranial Nerves

Question 1

Trigeminal Nerve (CN V)

Answer 1

Motor Innervation:

• mastication
• hyolaryngeal excursion
• tensing velum

Sensory Innervation:

• bolus manipulation
• sensation from mucus membranes mouth, cheek and anterior 2/3 of the tongue (not taste)
• size, viscosity, temperature, texture

Question 2

Facial Nerve (CN VII)

Answer 2

Motor Innervation:

• lip closure
• buccal tone
• hyolaryngeal excursion

Sensory and Autonomic Innervation:

• taste (Taste from the anterior 2/3 of the tongue)
• salivation

Question 3

Glossopharyngeal Nerve (CN IX)

Answer 3

MI:

• pharyngeal constriction
• hyolaryngeal excursion

SAI:

• taste and sensation (Sensation from the posterior 1/3 of tongue (including taste), the velum, the fauces and the superior portion of the pharynx)
• salivation

Question 4

Vagus Nerve (CN X)
largest nerve

Answer 4

MI:

• velopharyngeal closure
• tongue base retraction
• pharyngeal squeeze
• airway closure
• UES closure and opening
• esophageal motility

SAI:

• sentation
• Sensory information from the velum, posterior and inferior portions of the pharynx and all sensation in the larynx

Question 5

Accessory Nerve (CN XI)

Answer 5

Motor Innervation

- Pharyngeal shortening - Palatopharyngeus

Question 6

Hypoglossal Nerve (CN XII)

Answer 6

Motor Innervation

- Tongue motility – All extrinsic and intrinsic tongue muscles