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190lec7 - HKIN 190 Anatomy and Physiology I 7 The Nervous...

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7 – The Nervous System Introduction HKIN 190: Anatomy and Physiology I
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Learning Objectives: 1. To understand the function of the nervous system. 2. To understand the classification of the nervous system. 3. To know: a) the cells of the nervous system b) the structure of neurons c) the structure and function of myelin d) the difference between a neuron and a nerve
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Tissue types in the body CMEN C onnective Tissue Blood Bone Cartilage Connective Tissue Proper M uscle Smooth Skeletal Cardiac E pithelial Squamous Cuboidal Columnar Pseudostratified Transitional N ervous Q: What % body weight is the nervous system? A: 3%
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To understand the functions of the nervous system. Learning Objective 1
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Along with the endocrine system, the NS helps maintain homeostasis in the body (eg: overheating – sweating) Initiates all voluntary movements. Responsible for our perceptions, behaviours, memories. Functions of the nervous system
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To understand the classification of the nervous system. Learning Objective 2
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Classification of the nervous system The nervous system can be classified according to: 1. Function: Sensory NS Motor NS Integrative NS 2. Location Central NS (brain and spinal cord) Peripheral NS (all nerve tissue outside of brain/spinal cord)
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1. Sensory function: a fferent pathways sense changes in internal or external environment via sensory receptors Sensory/afferent neurons do this 3. Integrative function: interneuron pathways analyze information and “make decisions” about response interneurons/association neurons do this majority of neurons are interneurons/association neurons 5. Motor function: e fferent pathways respond to stimuli with muscle or gland response motor/efferent neurons do this Example: Touching a hot stove Classification of the nervous system by function
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Sensory neuron vs interneuron vs motor neuron
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1. Central nervous system (CNS) brain & spinal cord 2. Peripheral nervous system (PNS) all nerve tissue outside of brain & spinal cord 12 pairs 31 pairs Classification of the nervous system by location
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1. Central nervous system (CNS) 2. Peripheral nervous system (PNS) 1. Somatic nervous system Voluntary To and from skeletal muscles 2. Autonomic nervous system Involuntary To and from glands/ smooth & cardiac muscle 1. Parasympathetic NS 2. Sympathetic NS 3. Enteric Involuntary NS of GI tract Function independently of ANS and SNS 12 pairs 31 pairs Classification of the nervous system with PNS breakdown
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