WBR0614

Author	[[PageAuthor::Rim Halaby, M.D. [1]]]
Exam Type	ExamType::USMLE Step 1
Main Category	MainCategory::Anatomy, MainCategory::Pathophysiology
Sub Category	SubCategory::Neurology
Prompt	[[Prompt::A 72-year-old male patient with previous medical history of diabetes and hypertension presents to the emergency department for an acute onset of left leg paralysis. The patient tells the physician that he woke up in the morning and was not able to lift his left leg. Physical exam reveals paralysis and loss of sensation in the left leg with intact motion and sensation in the upper extremities and right lower extremities. The cranial nerves and cerebellar exam are normal. Stroke in which of the following areas may explain the symptoms of the patient? File:Cerebral cortex.gif ]]
Answer A	AnswerA::A
Answer A Explanation	AnswerAExp::
Answer B	AnswerB::B
Answer B Explanation	AnswerBExp::
Answer C	AnswerC::C
Answer C Explanation	AnswerCExp::
Answer D	AnswerD::D
Answer D Explanation	AnswerDExp::
Answer E	AnswerE::E
Answer E Explanation	AnswerEExp::
Right Answer	RightAnswer::
Explanation	[[Explanation::The cerebral cortex functions are specific to each area of the brain. The primary motor cortex is located in the posterior portion of the frontal lobe. It works in association with other motor areas including premotor cortex, the supplementary motor area, posterior parietal cortex, and several subcortical brain regions, to plan and execute movements. Branches of the middle cerebral artery provide most of the arterial blood supply for the primary motor cortex. The medial aspect that controls the lower extremities is supplied by branches of the anterior cerebral artery. Shown below is an image depicting the cerebral cortex functions. File:Cerebral-cortex-functions.gif Educational objective: The primary motor cortex controls motor activity, the lateral area supplied by the MCA controls the upper extremities, while the medial area supplied by the ACA controls the motor activity of the lower extremities. Educational Objective: References: ]]
Approved	Approved::No
Keyword
Linked Question	Linked::
Order in Linked Questions	LinkedOrder::