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Transcript
5/24/2017 Title: Anat & Phys 11/6/06 Objectives: To prepare to assess knowledge of the skeletal system and learn about the nervous system. Class Topics • Review for Skeletal System Test • Nervous System Do what you can, with what you have, where you are. Theodore Roosevelt Wednesday, May 24, 2017 12:29 PM Page: 1 5/24/2017 Class Assignments What • Skeletal System Test By When 11/8/06 • Due this class period • Due next class period • Due in the future Page: 2 5/24/2017 Nervous System • Divisions – Central Nervous System (CNS) • Brain & Spinal Cord • all sensory impulses arrive here • all motor impulses originate here – Peripheral Nervous System (PNS) • all nerves outside of CNS – cranial nerves - from brain » 12 pairs – spinal nerves - from spinal cord Page: 3 5/24/2017 PNS • 2 divisions – somatic (voluntary) • sensory and motor – autonomic (involuntary) • sympathetic – used during stressful times » injury, strenous physical activity, etc • parasympathetic – used during normal functioning Page: 4 5/24/2017 Page: 5 5/24/2017 Nerve Tissue • Neurons – nerve cells • Neuroglia – support and maintain neurons Page: 6 5/24/2017 Neuroglia (Figure 9-2) • • • • Astrocytes - CNS - control blood flow ependymal cells - CNS - form CSF Microglia - CNS - used to clean Oligodendrocytes - CNS - used to speed up action potentials • Schwann cells - found in PNS - aids in conduction of action potential and helps large neurons Page: 7 5/24/2017 • Cell body – cytoplasm, nucleus (with nucleolus), and organelles Neuron Parts • organelles including Nissl bodies (like RER) and lacking mitotic spindles • Dendrites – numerous – conduct action potential towards cell body • Axon – single – conduct action potential away from cell body Page: 8 5/24/2017 Page: 9
