A researcher is studying the brains of patients who recently died from stroke-related causes. One specimen has a large thrombus in an area of the brain that is important in relaying many modalities of sensory information from the periphery to the sensory cortex. Which of the following embryologic structures gave rise to the part of the brain in question?
AMetencephalon
BDiencephalon
CMesencephalon
DTelencephalon
EMyelencephalon
A 66-year-old man undergoes a coronary artery bypass grafting. Upon regaining consciousness, he reports that he cannot see from either eye and cannot move his arms. Physical examination shows bilaterally equal, reactive pupils. A fundoscopy shows no abnormalities. An MRI of the brain shows wedge-shaped cortical infarcts in both occipital lobes. Which of the following is the most likely cause of this patient's current symptoms?
ALipohyalinosis
BAtherothrombosis
CAmyloid angiopathy
DCardiac embolism
ESystemic hypotension
An 85-year-old woman otherwise healthy presents with left-sided weakness. Her symptoms started 4 hours ago while she was on the phone with her niece. The patient recalls dropping the phone and not being able to pick it up with her left hand. No significant past medical history. No current medications. Physical examination reveals decreased sensation on the left side, worse in the left face and left upper extremity. There is significant weakness of the left upper extremity and weakness and drooping of the lower half of the left face. Ophthalmic examination reveals conjugate eye deviation to the right. A noncontrast CT of the head is unremarkable. The patient is started on aspirin. A repeat contrast CT of the head a few days later reveals an ischemic stroke involving the lateral convexity of right cerebral hemisphere. Which of the following additional findings would most likely be seen in this patient?
AHomonymous hemianopsia
BHorner's syndrome
CAmaurosis fugax
DProfound lower limb weakness
EProsopagnosia
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