483
Define peripheral nervous system and list its components.
T
he human brain, for all its sophistication, would be useless
with-
out its links to the outside world. Consider one experiment that illustrates this
point. Volunteers who were deprived of sensory input by being blindfolded and
suspended in warm water in a sensory deprivation tank hallucinated. One saw charging
pink and purple elephants. Another heard a chorus, still others had taste hallucinations.
Our very sanity depends on a continuous flow of information from the outside.
Equally important to our well-being are the orders sent from the CNS to voluntary
muscles and other effectors of the body, which allow us to move and take care of our own
13
The Peripheral Nervous System
and Reflex Activity
PART 1
Sensory Receptors
and Sensation
Sensory Receptors
(pp. 484–487)
Sensory Integration: From Sensation
to Perception
(pp. 487–490)
PART 2
Transmission Lines:
Nerves and Their Structure
and Repair
Nerves and Associated Ganglia
(pp. 490–492)
Cranial Nerves
(pp. 492–501)
Spinal Nerves
(pp. 501–511)
PART 3
Motor Endings
and Motor Activity
Peripheral Motor Endings
(p. 511)
Motor Integration: From Intention
to Effect
(pp. 511–513)
PART 4
Reflex Activity
The Reflex Arc
(p. 513)
Spinal Reflexes
(pp. 513–519)
Developmental Aspects of the Peripheral
Nervous System
(p. 519)
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