Please enable JavaScript.
Coggle requires JavaScript to display documents.
Peripheral Nervous System (PNS), NUR ATIQAH BINTI SHAHRIZAN (AE170135) -…
Peripheral Nervous System (PNS)
Structure of the PNS
31 pairs of nerves branching from the spinal cord (spinal nerves)
12 pairs that emerges from the brain (cranial nerves)
43 nerve pairs
consider separate from the brain and spinal cord
form the basis of the peripheral nervous system
all 43 segments of nerves in PNS perform sensory, motor, or mixed (both) fuction.
2 types of nervous
sensory (afferent)
detect various sensations such as pain and heat
transmit messages towards the CNS to be interpreted by either the spinal cord or the brain
motor (efferent)
transmit messages away from the CNS
stimulates effectors (skin, sense, organs, musle, etc) to perform a function or reflex.
the reflex arc
sensory detection
interpretation of sensory input
motor output
the peripheral nervous system
has 2 separate divisions based on voluntary and involuntary responses
voluntary - consciously controlled
involuntary - unconsciously controlled
somatic nervous system
PNS division that controls voluntary responses
responsible for relaying sensory and motor information between the outside environment and the CNS
innervate outer sections at the body (skin and skeletal muscles)
any muscle movement or voluntary motor output uses the somatic nervous system
autonomic nervous system
PNS division that handles involuntary movement in the body
innervates our internal organs
controls vital functions (heart rate, digestion, respiration and breathing)
perform opposite functions to maintain internal balance
sypathetic
fight of flight response system
causes general alertness and excitement
body's way of responding to a perceived threat
parasympathetic
rest and digest response system
restores the body to a calm or restful state.
NUR ATIQAH BINTI SHAHRIZAN (AE170135)
