Cranial nerves IX, X, XI & XII

The video tutorial covers the functions and clinical relevance of cranial nerves IX, X, XI, and XII. It explains the glossopharyngeal nerve's role in taste, salivation, and the gag reflex. The vagus nerve's functions in swallowing, speech, and visceral motor control are highlighted. The spinal accessory nerve's role in shoulder movement and head rotation is discussed, along with the hypoglossal nerve's function in tongue movement.

Which muscle is innervated by the glossopharyngeal nerve?

• Stylopharyngeus

• Buccinator

• Orbicularis oris

• Masseter

What reflex is associated with the glossopharyngeal nerve?

• Gag reflex

• Blink reflex

• Cough reflex

• Knee-jerk reflex

What is the primary function of the vagus nerve in the larynx?

• Saliva production

• Speech production

• Taste sensation

• Vision

What is the clinical significance of the vagus nerve's visceral motor function?

• It improves balance.

• It regulates heart rate and digestion.

• It controls eye movement.

• It enhances hearing.

Through which opening does the spinal accessory nerve pass?

• Hypoglossal canal

• Optic canal

• Jugular foramen

• Foramen ovale

Which muscle is responsible for tongue protrusion?

• Styloglossus

• Hyoglossus

• Genioglossus

• Palatoglossus

What happens to the tongue when the hypoglossal nerve is damaged on one side?

• It deviates to the opposite side.

• It remains in the center.

• It deviates to the same side.

• It retracts into the mouth.