Class3_Organization+of+Nervous+System

Class3_Organization+of+Nervous+System - Outline...

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1 Organization of Nervous System Outline • Methods for Looking in the Human Brain • Peripheral Nervous System – Sympathetic – Parasympathetic • Central Nervous System Central Nervous System • Until the late 20 th century, the main method for studying brain anatomy was examination of cadavers Wilhelm Braune: Topographisch-anatomischer Atlas, 1872 Imaging Techniques Computerized axial tomography (CAT or CT) – a measure of X-ray absorption at several positions around the head, maps tissue density Can’t see specific brain structures well Figure 2.21 Visualizing the Living Human Brain (Part 1)
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2 Magnetic Resonance Imaging Magnetic Resonance Imaging (MRI) gives higher resolution images Uses magnets and radio waves to determine tissue density in the brain Allows researchers to see structure in brain, but cannot assess activity Figure 2.21 Visualizing the Living Human Brain (Part 2) PET Scans Positron emission tomography (PET) – gives images of brain activity • Uses radioactive chemicals injected into the bloodstream and maps their destination by the radioactive emissions • By injection radioactive glucose, can determine which brain areas are active during a specific activity Figure 2.21 Visualizing the Living Human Brain (Part 3) Functional MRI Functional MRI (fMRI) detects small changes in brain metabolism, like oxygen use, in active brain areas. fMRI can show how networks of brain structures respond to various stimuli or while performing specific tasks Figure 2.21 Visualizing the Living Human Brain (Part 4)
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3 Question • Julie has been in a car accident and piece of shrapnel has pierced her skull. A neurosurgeon wants to determine which parts of the brain are damaged. Which type of scan should be ordered? Nervous System
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Class3_Organization+of+Nervous+System - Outline...

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