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ELAINE N. MARIEB
EIGHTH EDITION
7
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
PowerPoint® Lecture Slide Presentation by Jerry L. Cook, Sam Houston University
ESSENTIALSOF HUMANANATOMY
& PHYSIOLOGY
PART AThe Nervous System
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Functions of the Nervous System Sensory - gather information
monitor changes inside and outside the body
Integration – process information
To decide if action is needed
Motor output
respond
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Structural Classification of the Nervous System Central nervous system (CNS)
Brain
Spinal cord
Peripheral nervous system (PNS)
Nerve outside the brain and spinal cord
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin CummingsFigure 7.1
Functional Classification of the Peripheral Nervous System Sensory division
Nerve fibers that carry information to the central nervous system
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin CummingsFigure 7.1
Functional Classification of the Peripheral Nervous System Motor division
Nerve fibers that carry impulses away from the central nervous system
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin CummingsFigure 7.1
Functional Classification of the Peripheral Nervous System
Motor division
Two subdivisions Somatic nervous system = voluntary
Autonomic nervous system = involuntary
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Organization of the Nervous System
Figure 7.2
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
The Reflex Arc Reflex – quick/involuntary responses to
stimuli
Reflex arc – 5 elements are:
receptor, sensory neuron, interneuron, motor neuron, effector
Figure 7.11a
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Simple Reflex Arc
Figure 7.11b–c
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Types of Reflexes and Regulation Autonomic reflexes (related to the involuntary)
Pupil size
glands (salivary, sweating)
Smooth muscle (waste elimination)
Somatic reflexes (related to the voluntary)
Withdrawal
Knee-jerk