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Test_5notes - Test 5 NERVOUS SYSTEM- CNS (central nervous...

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Unformatted text preview: 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- 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 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 p erikaryon o Nucleus Loses mitotic a bility after about 6 m onths (cannot replicate) o Cytoplas m o Mitochondrion o Nissl bodies Similar to riboso m es, synthesize proteins o Neurofibrils Protein rods that run through the cell bodies a nd through the rest Carry inform ation Begin at the distal e nd of the d endrites o Dendrites Bring inform ation into the cell body- Axon hillock o Start of the axon 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...
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This note was uploaded on 09/30/2011 for the course KIN 2500 taught by Professor Hargroder during the Fall '08 term at LSU.

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Test_5notes - Test 5 NERVOUS SYSTEM- CNS (central nervous...

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