Deﬁne peripheral nervous system and list its components.
he human brain, for all its sophistication, would be useless
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
The Peripheral Nervous System
and Reﬂex Activity
Sensory Integration: From Sensation
Nerves and Their Structure
Nerves and Associated Ganglia
and Motor Activity
Peripheral Motor Endings
Motor Integration: From Intention
The Reﬂex Arc
Developmental Aspects of the Peripheral