The supermassive black hole at the center of the NGC4261 galaxy is thought to have a mass of 1 billion suns.(a) Calculate its Schwarzschild radius and compare itwith the size of our solar system. (b) How much timewould this black hole take to evaporate by Hawkingradiation?
Black 3 lecture 8 - Blood Supply and CSF 1. Describe what is meant by “anterior circulation” and “posterior circulation” and what vessels give rise to the different blood flow patterns 2. List the 3 large vessel that supply blood to the cerebrum and the major blood vessel from which they originate Come from Left/right common carotid art - Left Internal Carotid Artery, Right Internal Carotid Artery Come from Vertebral arteries - combine to for basilar artery - provide blood to poster ⅓ of brain 3. Describe the body regions provided blood by the anterior cerebral artery, middle cerebral artery, posterior cerebral artery and the vertebrobasilar arteries Anterior cerebral artery - trunk and lower extremity middle cerebral artery - (largest vascular territory) - upper limbs and face, speech, auditory Posterior cerebral artery - occipital lobe (vision), inferior temporal lobe (face recognition) Vertebrobasilar arteries - join to form 1 basilar artery that provides blood to the brain stem, cerebellum, and posterior ⅓ rd of the cerebrum 4. Compare stroke and transient ischemic attack Stroke - Thrombotic “clot” - Hemorrhagic “bleeding in the brain” - Ischemia - insufficient blood supply to the brain Transient Ischemic Attack (TIA) - a transient episode of neurological deficit - DOES NOT RESULT IN NEUROLOGICAL DAMAGE - NOT A “MINI STROKE” - primary cause is embolism 5. Compare thrombotic and hemorrhagic strokes Thrombotic “clot” - can be broken up by medication - untreated usually lead to Hemorrhagic strok