Chapter 9 The Nervous System Day 1 Pages: 214-220 NgGKSNiNw.

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Chapter 9 The Nervous System Day 1 Pages: NgGKSNiNw

Introduction  2 divisions  Central Nervous System  CNS  Brain and Spinal Cord  Peripheral Nervous System  PNS  Nerves of the body that connect it to the CNS

Introduction  Both CNS and PNS  Provide sensory, integrative, and motor functions  Nervous Tissue  Neurons  structural and functional units of nervous system  Neuroglial Cells CFk

General Functions of the Nervous Systems  Sensory functions employ receptors that detect internal and external changes  Integrative functions collect sensory information and make decisions that motor functions carry out  Motor functions stimulate effectors to respond

Neuron Structure  Neuron-Structural and Functional Unit  Consists of:  Cell body  Nerve fiber  Organelles  Dendrites and the cell body provide receptive surfaces  A single AXON arises from the cell body and may be enclosed in a myelin sheath and a neurilemma.

Types of Neurons  Classification of Neurons  On the basis of structure:  Multipolar  Bipolar  Unipolar  On the basis of Function:  Sensory neurons  Interneurons  Motor neurons

Types of Neuroglial Cells  Neuroglial Cells  Assessory cells  Function:  Fill spaces, support neurons, hold nervous tissue togther, produce myelin, help regulate the concentrations of nutrients and ions, carry on phagocytosis  Types:  Schwann Cells  Astrocytes  Oligodendrocytes  Microglial cells  Ependymal cells

Short Answer Review  What is the difference between a neuron and a neuroglial cell?  Explain how neurons are classified according to structure or function.  Name and describe four types of neuroglial cells  What are some functions of neuroglial cells.