A 22-year-old boxer suffers a concussion during a boxing match and is rushed to the emergency room. According to his trainer, the blow deflected his head upward and posteriorly. Loss of consciousness...

A 22-year-old boxer suffers a concussion during a boxing match and is rushed to the emergency room. According to his trainer, the blow deflected his head upward and posteriorly. Loss of consciousness in this patient presumably occurred because of a functional paralysis of neurons in which of the following anatomic regions of his brain?

(A) Brainstem reticular formation

(B) Cerebellum

(C) Hypothalamus

(D) Periventricular white matter

(E) Temporoparietal area