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Download Chapter 7 The Nervous System - Mrs. heninger
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Unit 3: Integration Station: The Nervous System THE NERVOUS SYSTEM Chapter 9 Part 1: Organization of the Nervous System Part 2: Nervous Tissue: Structure & Function Part 3: Central Nervous System Part 4: Peripheral Nervous System Part 5: Developmental Aspects of the Nervous System & Drug Use Human Anatomy & Physiology The Nervous System Part 1: Organization of the Nervous System Unit 3: Integration Station: The Nervous System 9.1 AGENDA Do Now Introduction Mini-Lesson Aim: What are the functions and parts of the nervous system? Objective: I will describe the function of the nervous system and name the major divisions. SC.912.L.14.21 Summary Work Period Exit Slip Do now: Think Ink…Pair Share Unit 3: Integration Station: The Nervous System Functions of the Nervous System 1. Sensory input – gathering information To monitor changes occurring inside and outside the body “Changes” = stimuli Examples: Temperature, Sound, Pain, Etc. 2. Integration To process and interpret sensory input and decide if action is needed Functions of the Nervous System 3. Motor output (Homeostasis!) A response to integrated stimuli The response activates muscles or glands Structural Classification of the Nervous System Central Nervous System (CNS) Contains the: Brain Spinal cord Peripheral Nervous System (PNS) Nerves outside the brain and spinal cord Includes Cranial Nerves & Spinal Nerves Basic Divisions of the Nervous System Figure 12.2 Functional Classification of the PNS PNS structures are divided into two subdivions 1. Sensory (afferent) division Nerve fibers that carry information to the central nervous system from the body. Functional Classification of the PNS Receptors located in various parts of the body send signals TO the brain LOCATIONS: Skin, Skeletal Muscles & Joints = Somatic Sensory Fibers Visceral Organs = Visceral Sensory Fibers Functional Classification of the PNS Motor (efferent) division Nerve fibers that carry impulses away from the central nervous system to organs, muscles, & glands. The impulses “effect” (bring about) a motor response. Functional Classification of the PNS Motor (efferent) divisions Two subdivisions 1. Somatic Nervous System = voluntary (skeletal) 2. Autonomic Nervous Nystem = involuntary (smooth muscle, cardiac, & glands) PAGE 250 & 252 Organization of the Nervous System Human Anatomy & Physiology The Nervous System Part 2: Nervous Tissue – Structure & Function Unit 3: Integration Station: The Nervous System Nervous Tissue: Neurons Neurons = nerve cells Cells specialized to transmit messages Major regions of neurons 1. Cell Body - contains the nucleus and two extensions 2. Dendrites – shorter, more numerous, receive information 3. Axons – single, long “fiber” which conducts impulse away from the cell body, sends information Unit 3: Integration Station: The Nervous System Using the given words and the article label the diagram. (Drawing #1) Unit 3: Integration Station: The Nervous System Neuron Anatomy (Drawing 1) Unit 3: Integration Station: The Nervous System Nervous Tissue: Support Cells (Neuroglia) Four Types 1. Astrocytes Abundant, star-shaped cells Brace neurons Form barrier between capillaries and neurons Control the chemical environment of the brain Unit 3: Integration Station: The Nervous System Nervous Tissue: Support Cells 2. Microglia Spider-like phagocytes Dispose of debris Respond to immunological alarms 3. Ependymal cells Line cavities of the brain and spinal cord Circulate cerebrospinal fluid Unit 3: Integration Station: The Nervous System Nervous Tissue: Support Cells 4. Oligodendrocytes Provide insulation around the axons Unit 3: Integration Station: The Nervous System Nervous Tissue: Support Cells (Neuroglia) Five Types Nervous Tissue: Support Cells 5. Schwann cells Form insulating myelin sheath around the neurons