KIN 2500 Test 5

KIN 2500 Test 5 - Test 5 NERVOUS SYSTEM - CNS (central...

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Test 5 NERVOUS SYSTEM - CNS (central nervous system) o Generates responses - Input (PNS) o Somatic nervous system (to the CNS) Somatic and special sensory receptors and somatic neurons o Autonomic nervous system (to the CNS) Autonomic sensory receptors and autonomic sensory neurons o Enteric nervous system (to the CNS) Enteric sensory receptors and enteric sensory neurons in enteric plexuses of GI tract - Output (PNS) o Somatic motor neurons Voluntary Effectors- skeletal muscles o Autonomic motor neurons Involuntary Sympathetic and parasympathetic divisions Can direct the enteric system to become more active Effectors- smooth muscle, cardiac muscle, and glands o Enteric motor neurons Involuntary Enteric plexuses of GI tract Effectors- smooth muscle, glands, and endocrine cells of the GI tract Nervous System Functions
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- Sensory o Everything around us - Integrative o Takes place in the CNS o Biggest job of the CNS, has to make sense of everything - Motor o Response to the information Cell types - Neurons- Convey impulses o Motor (efferent)- carry the command from the CNS to the effectors o Sensory (afferent)- toward the CNS, brings the sensory information to the CNS o Association (internuncial, interneuron)- outnumber the motor and sensory Connect the sensory and motor neurons Can branch over and over and send message to effectors - Neuroglia- support/protect (glial cells) o CNS Oligodendrocytes Forms the myelin sheath around neurons in the CNS Do not have a neurilemma Astrocytes Binds the neurons in close proximity to the blood vessels Forms scar tissue (astroglial proliferation) impairs action and function o Lesion is the name for damage to the nervous system Ependymal Involved in the circulation of CSF
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Microbes Small phagocytes o PNS Satellite Repair Neurolemmocyte (Schwann cell) Forms the myelin sheath around axons of the PNS - Purkinje cell o Allowed for wide spread connectivity Typical Motor Neuron - Cell body- Also known as the perikaryon o Nucleus Loses mitotic ability after about 6 months (cannot replicate) o Cytoplasm o Mitochondrion o Nissl bodies Similar to ribosomes, synthesize proteins o Neurofibrils Protein rods that run through the cell bodies and through the rest of the cell Carry information Begin at the distal end of the dendrites o Dendrites Bring information into the cell body - Axon hillock o Start of the axon
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o Highly sensitized - Initial segment o Axon begins to take its true shape o Highly sensitized as well - Axon o Axolemma Plasma membrane of the axon o Axoplasm Cytoplasm of the axon (Neurofibrils running through here) - Telodendrium (axon terminals) o Synaptic end bulb - Axon collateral o When a neuron has two axons o Sometimes will come back and synapse on its own cell body and tell itself to calm down - Myelin sheath o Schwann cell (PNS) Neurolemma Outside of the Myelin sheath
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This note was uploaded on 06/01/2011 for the course KIN 2500 taught by Professor Hargroder during the Spring '08 term at LSU.

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KIN 2500 Test 5 - Test 5 NERVOUS SYSTEM - CNS (central...

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