Advanced Recurrent Laryngeal Nerve Quiz

Q1. Which embryological event primarily explains the different adult courses of the right and left recurrent laryngeal nerves?

• Fusion of the palatal shelves
• Rotation of the midgut
• Closure of the neural tube
• Remodeling of the aortic arch arteries and descent of the heart

Q2. The left recurrent laryngeal nerve becomes hooked around derivatives associated primarily with which embryonic arch artery?

• First aortic arch
• Sixth aortic arch
• Third aortic arch
• Second aortic arch

Q3. Why does the right recurrent laryngeal nerve not descend around an arterial structure within the thorax in normal anatomy?

• The right recurrent laryngeal nerve supplies no thoracic structures
• The right recurrent laryngeal nerve develops from the phrenic nerve
• The right vagus nerve never enters the thorax
• Regression of embryonic vascular structures on the right changes its recurrent course

Q4. A mass in the aortopulmonary window may produce hoarseness by compressing which nerve?

• Right recurrent laryngeal nerve
• Intercostobrachial nerve
• Left recurrent laryngeal nerve
• Right phrenic nerve

Q5. Enlargement of which cardiovascular structure can produce hoarseness through compression of the left recurrent laryngeal nerve?

• Radial artery
• Structures adjacent to the aortic arch and pulmonary artery
• Femoral artery
• Inferior vena cava below the diaphragm

Q6. Which functional deficit is especially dangerous in bilateral recurrent laryngeal nerve injury?

• Loss of tongue protrusion
• Impaired vocal fold abduction with airway compromise
• Loss of shoulder elevation
• Paralysis of the diaphragm only

Q7. A unilateral recurrent laryngeal nerve lesion most directly compromises the motor supply to which muscle?

• Stylopharyngeus
• Cricothyroid
• Tensor veli palatini
• Posterior cricoarytenoid

Q8. Which statement correctly compares the recurrent laryngeal nerve with the external branch of the superior laryngeal nerve?

• The recurrent laryngeal nerve supplies most intrinsic laryngeal muscles, while the external laryngeal nerve supplies cricothyroid
• Neither nerve carries motor fibers
• Both nerves supply only cricothyroid
• The external laryngeal nerve supplies all intrinsic laryngeal muscles

Q9. Which relationship makes the recurrent laryngeal nerves particularly important during thyroid surgery?

• Their origin from the thyroid gland
• Their passage through the thyroid follicles
• Their close relationship with the thyroid gland and inferior thyroid arteries
• Their passage through the internal jugular vein

Q10. Which description best summarizes the recurrent laryngeal nerves?

• Parasympathetic nerves supplying the diaphragm
• Somatic nerves arising from cervical spinal anterior rami
• Vagal branches with asymmetric recurrent courses that provide major motor and sensory innervation to the larynx
• Sympathetic nerves supplying only the thoracic viscera