Advanced Larynx Quiz

Q1. Why can bilateral recurrent laryngeal nerve injury produce severe airway compromise?

• Only supraglottic sensation is lost
• Loss of bilateral vocal fold abduction can critically narrow the glottic airway
• Both vocal folds become maximally abducted
• The cricothyroid muscles contract continuously

Q2. What functional deficit is most characteristic of an external superior laryngeal nerve lesion?

• Reduced ability to tense the vocal folds and produce high pitches
• Loss of tongue protrusion
• Bilateral paralysis of the posterior cricoarytenoids
• Loss of all laryngeal sensation

Q3. Why is the internal laryngeal nerve important for airway protection?

• It is the sole motor nerve to the vocal folds
• It directly opens the upper esophageal sphincter
• It innervates the diaphragm
• It provides supraglottic sensation important for protective airway reflexes

Q4. Which coordinated changes protect the laryngeal airway during swallowing?

• Maximal vocal fold abduction with laryngeal depression
• Opening of the laryngeal ventricle alone
• Laryngeal elevation with inlet narrowing and glottic closure
• Posterior displacement of the larynx with glottic widening

Q5. Where is an emergency cricothyrotomy performed?

• Through the posterior cricoid lamina
• Through the thyrohyoid membrane
• Through the median cricothyroid ligament
• Through the epiglottic cartilage

Q6. Which embryological structure gives rise to the laryngeal epithelium?

• Paraxial mesoderm alone
• Endoderm of the laryngotracheal tube
• Surface ectoderm of the first pharyngeal cleft
• Neural tube neuroectoderm

Q7. Which pharyngeal arches contribute most directly to the cartilages and muscles of the larynx?

• First and second arches
• First and fifth arches
• Fourth and sixth pharyngeal arches
• Second and third arches

Q8. Why is the vagus nerve pattern of laryngeal innervation developmentally meaningful?

• The superior laryngeal nerve develops from the hypoglossal nerve
• The vagus supplies only first arch derivatives
• The recurrent laryngeal nerve represents the second arch
• Its superior and recurrent laryngeal branches reflect fourth and sixth arch derivatives

Q9. Why can cricoarytenoid joint fixation mimic recurrent laryngeal nerve palsy?

• Both paralyze only the cricothyroid
• Both selectively eliminate supraglottic sensation
• Both can cause vocal fold immobility through different mechanical and neural mechanisms
• Both fracture the thyroid cartilage

Q10. Which statement best integrates laryngeal anatomy?

• The larynx functions only during speech
• A rigid bony tube serves only as an air passage
• The larynx contains no synovial joints or specialized sensory innervation
• A mobile cartilaginous and neuromuscular framework integrates respiration, airway protection, and phonation