In a freak hunting accident, a 16-year-old boy was shot with an arrow that penetrated into his suboccipital triangle, injuring the suboccipital nerve between the vertebral artery and the posterior arch of the atlas. Which of the following muscles would be unaffected by such a lesion?
Following a penetrated injury in the submandibular triangle, the tongue of a 46-year-old patient deviates to the left on protrusion. Which of the following nerves is injured?
Following radical resection of a primary tongue tumor, a 73-year-old patient has lost general sensation on the anterior two-thirds of the tongue. This is probably due to injury to branches of which of the following nerves?
During surgery for a malignant parotid tumor in a 68-year-old woman, the main trunk of the facial nerve is lacerated. Which of the following muscles is paralyzed?
During surgery on a 57-year-old man for a squamous cell carcinoma of the neck, a surgeon notices profuse bleeding from the deep cervical artery. Which of the following arteries must be ligated immediately to stop bleeding?
During surgical treatment of portal hypertension in a 58-year-old man with liver cirrhosis, a surgeon inadvertently lacerates the dilated paraumbilical veins. The veins must be repaired to allow collateral flow. Which of the following ligaments is most likely severed?
During later development of the respiratory system, the laryngotracheal tube maintains communication with the primitive foregut. Which of the following embryonic structures is most likely responsible for partitioning these two embryonic structures?
During an annual health examination of a 45-year-old woman, a physician finds hypersecretion of norepinephrine from her suprarenal medulla. Which of the following types of nerve fibers are most likely overstimulated?
During an outbreak of meningitis at a local college, a 21-year-old student presents to a hospital emergency department complaining of headache, fever, chills, and stiff neck. On examination, it appears that he may have meningitis and needs a lumbar puncture or a spinal tap. Cerebrospinal fluid (CSF) is normally withdrawn from which of the following spaces?
During early development, the midgut artery seems to be significantly narrowed at its origin. Which of the following structures is derived from the midgut and might receive insufficient blood supply?