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THE PERIPHERAL NERVOUS SYSTEM (REFLEX ARCS (synaptic transmission (occurs…
THE PERIPHERAL NERVOUS SYSTEM
collection of nerves
branch off the CNS
known
as the PNS
and the categories are
spinal nerves
31 pairs of nerves
emerge from the spianl cord
sequentially
from the different regions
4 more items...
all are dual-purpose
cranial nerves
12 pairs
of nerves emerging from
different regions of the brain
they send messages to, and receive messages from
different parts of the
head
neck
innervate organs
responsible for sensory detection
the facial muscles, the tongue, the neck...
REFLEX ARCS
synaptic transmission
occurs bewtween
motor neurons
sensory neurons
on receiving the sensory input
the nerve impulse moves
towards the brain
relaying the message
at the same time
a 'short-circuit'
occurs within
spinal cord
allowing a rapid
automatic response
which helps
prevent an injury