absence, anoxic, blood, brain, brains, brainstem, caput, cerebellar, cerebellum, cranium, damage, head, heads, hematology, hemology, hemorrhage, hemorrhaged, hemorrhaging, lack, medulla, medullary, myelencephalon, o2, oblongata, oxygen, pons, pontine, pressure, pressures, skull, skulls, stem, stems, supply, swelling, swollen, tissue, tissues