Ch4_ppt_-_Brain_and_Behavior_Compatibility_Mode_

Ch4_ppt_Brain_and_Behavior_Compatibility_Mode_

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Unformatted text preview: etect states of consciousness or abnormalities Brain: most active energy consumer (never rests) How do neuroscientists discover its secrets ? 4. Brain Imaging a) Computerized Axial Tomography (CT/CAT) Scans: Analyzing X-rayed slices from many brain angles b) M agnetic Resonance Imaging (MRI): Colored images of atoms responding to delivery of magnetic pulse structure 12 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Brain: most active energy consumer (never rests) How do neuroscientists discover its secrets ? 4. Brain Imaging c) Positron-Emission Tomography (PET) Scans: brain ACTIVITY like metabolism, blood flow, & neurotransmitter activity (thru glucose consumption) d) Functional MRI (fMRI): pictures of blood flow taken <1 sec apart live presentations of activity oxygen concentration of blood Function In In Ψ, the BRAIN is the most important physical is organ organ & consists of NEURONS Neurons are: Neurons are: Basic building Basic building blocks of nervous system Billions specialized Billions of specialized cells Linked Linked together in circuits, generate electricity (nerve (nerve impulses) & release chemicals release (communicate) (communicate) Found in Found in both the brain & the spinal cord Vary Vary greatly in size & shape Main Main functions: receive, process, & send messages m essages Supported Supported by glial cells (don’t send nerve glial (don’t impulses, but manufacture nutrients needed by neurons & absorb toxins & waste material & hold the the neurons in place) 13 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 Structure & Function of Neurons The Neuron - Structure Cell Body Cell body (soma) contains biochemical structures (soma) needed to keep neuron alive. Nucleus carries genetic info for cell to function & develop. All is covered by a cell cell-membrane. 14 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 The Neuron - Structure Dendrites Cell Body Dendrites: specialized receiving units like antennae that collect messages from neighboring neurons and send them them to cell body The Neuron - Structure Dendrites Cell Body Axon Axon terminals Axon: conducts electrical impulses away from cell conducts body to other neurons, muscles, or glands. Branches out to form axon terminals axon 15 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 10/28/2009 The Neuron - Structure Dendrites Cell Body Axon terminals Axon Myelin sheath Myelin Sheath: a whitish fatty insulation derived from whitish glial cells during development; increases the speed of nerve nerve conduction The Neuron - Structure Dendrites Cell Body Nodes of Ranvier Axon Axon terminals Myelin sheath Nodes of Ranvier: regular interruptions to the myelin regular sheath sheath 16 Create PDF files without this message by pur...
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This document was uploaded on 01/15/2014.

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