AnS214-Week 4- PART 2 - Lectures Fri
AnS214-Week 4- PART 2 - Lectures Fri AnS 214
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This 6 page Class Notes was uploaded by Megan Spiegel on Sunday September 18, 2016. The Class Notes belongs to AnS 214 at Iowa State University taught by Dr. Adur in Fall 2016. Since its upload, it has received 69 views. For similar materials see Domestic Animal Physiology in Animal Science at Iowa State University.
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Date Created: 09/18/16
Organ System #3: N ervous System ❏Internal Coordination and Homeostasis ❏Basic Functioning of the Nervous System 1. Sensory Input deciphers message 2. Integration ecides what to be done 3. Motor Output does what was decided by the integration step ❏CNS (Central Nervous System) ❏Parasympathetic & Sympathetic: Functions of Nervous System Diagram ❏Brain Facts Majority of brain is water and fat (mushy) Meninges: connective tissue and protection for the brain CSF: cerebrospinal fluid ❏ Grey Matter = cell bodies ❏ White Matter = composed of all axons ❏PNS (Peripheral Nervous System) Cranial Nerves ❏Sensory Neuron ❏Autonomic ❏ Sympathetic only in terms of Fight or Flight ❏ Parasympathetic does most of the work → Autonomic Motor (association) Neurons 1. Smooth muscle 2. Cardiac muscle 3. Glands ❏ A major part of the PNS ❏Neuroglial Cells supports and maintains neurons 1. Astrocytes 2. Oligodendrocytes 3. Microglia 4. Epidermal Cells ❏Neuron: Structural Unit of Nervous System Large; highly specialized cells Extreme longevity Amniotic does not actively divide High metabolic rate ❏ 3 Responses 1. Excitability ability to respond to stimuli 2. Conductivity produce traveling electrical impulses 3. Secretion → terminal axon → chemical neurotransmitter secreted into synapse ❏Types of Neurons: Basic Types ❏3 Functional Classifications of Neurons 1. Sensory afferent 2. Motor association neurons 3. Interneuron efferent ❏Myelination ❏ Cells wrap around an axon Acts as protective insulation ❏ In CNS = Oligodendrocytes ❏ In PNS = Schwann Cells Nodes of Ranvier: gaps in the myelination
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