The deficit is purely sensory involving anatomic structures that are adjacent in the way they are mapped on our cortex. Think back to the sensory homunculus. What we are looking for here is the primary somatosensory cortex, which is located in the post central gyrus.
He presents with an abnormal sensation of his left hand that spreads to both his left arm and face. A lesion of the postcentral gyrus would cause this as it it responsible for sensation.
focusAlso, remember: "The anterior and middle cerebral arteries provide the postcentral gyrus blood supply.[12] The anterior cerebral artery is responsible for perfusing the medial third of the postcentral gyrus, while the middle cerebral artery perfuses the lateral two-thirds of the postcentral gyrus.[12]"
https://www.ncbi.nlm.nih.gov/books/NBK549825/
So if the question was asking for the blood supply to this region instead, it would most likely be the MCA.+
submitted by mamorumyheart(14)
The deficit is purely sensory involving anatomic structures that are adjacent in the way they are mapped on our cortex. Think back to the sensory homunculus. What we are looking for here is the primary somatosensory cortex, which is located in the post central gyrus.