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PERIPHERAL NERVOUS SYSTEM (PNS) :pen: (Structure of the PNS (43 Nerve…
PERIPHERAL NERVOUS SYSTEM (PNS) :pen:
SENSORY NERVES
Structure of the PNS
31 pairs of nerves branching from spinal cord
43 Nerve pairs
separate from brain and spinal cord
form the basis of peripheral nervous system
Sensory (Afferent)
Detect sensations e.g. pain, heat
Transmit messages towards CNS to be interpreted by spinal cord/ brain.
Motor (Efferent)
Transmit messages away from CNS
Stimulate effector to reflex.
12 pairs emerge from the brain
Reflex Arc
sensory detection
interpret sensory input
motor output
MOTOR NERVES
somatic
controls voluntary responses
responsible relaying sensory and motor information
innervate outer sections of the body
autonomic
sympathetic
fight & flight response
causes general alertness and excitement
body's way of responding to a perceived threat
parasympathetic
rest & digest response
restore body to a calm/ restful state
innervates internal organs
controls vital functions
heart rate
respiration & breathing
digestion
