A 34-year-old woman comes to the emergency department because of a large mass at the center of her neck. Physical examination and subsequent ultrasound show a tumor of the thyroid gland. Biopsy suggests a benign tumor but because of its large size a partial thyroidectomy is performed. Twenty-four hours following the surgery, in which the inferior thyroid artery was ligated, the patient develops hoarseness and has difficulty breathing on exertion. Which of the following nerves was most likely injured during the surgical procedure? 

A 59-year-old man was brought to the emergency department after falling from a three-story scaffolding. On arrival, the patient is unconscious with a fractured jaw, broken teeth, facial lacerations, and an open tibial fracture. To secure an airway, an emergency tracheotomy is performed where brisk arterial bleeding suddenly occurred from the midline incision over the trachea. Which of the following vessels was most likely cut? 

A 55-year-old man comes to the office because of pain while chewing for the past 3 months. Physical examination shows hoarseness of voice and pain on swallowing. A lateral x-ray of the neck shows a mass at the tracheoesophageal groove. Which of the following nerves is most likely affected by the mass?

A 5-year-old boy is brought to the emergency department unconscious after falling from a tree. An emergency tracheostomy is performed to establish an airway. During the procedure, profuse dark venous bleeding suddenly occurs from the midline incision over the trachea. Which of the following vessels was most likely cut? 

A 30-year-old woman comes to the physician because of hoarseness of her voice after undergoing a total thyroidectomy for a cancerous thyroid nodule 3 weeks ago. Physical examination shows a well-healing surgical scar. She is able to swallow sips of water without difficulty. Which nerve was most likely injured during the operation?