A 54-year-old man undergoes left carotid artery surgery. Postoperatively, he presents with difficulty depressing the hyoid bone during swallowing (HR 88 bpm, BP 142/86 mmHg, RR 16, temp 37.2°C). Tongue protrusion and shoulder shrug remain intact. Neck ultrasound shows no hematoma. He denies vocal hoarseness or facial drooping. Which of the following nerves was most likely injured during the surgical procedure?
- A)Vagus nerve
- B)Hypoglossal nerve
- C)Ansa cervicalisGABARITO
- D)Phrenic nerve
- E)Accessory nerve
Explicação
The ansa cervicalis innervates the strap muscles of the neck that depress the hyoid bone and larynx after swallowing. Isolated infrahyoid weakness with intact tongue and trapezius function localizes best to this cervical loop. Ver explicação completa e trilha adaptativa →