SpinalCord
Brain
Nerves
• PNS consists of 43 pairs of nerves that transmit info to and from CNS
• 12 pairs of cranial nerves enter the brain directly
• 31 pairs of spinal nerves enter the spinal cord between vertebrae
Skeletal(Somatic)
Sympathetic Parasympathetic
Autonomic
Peripheral Nervous System
• Controls movement of skeletal muscles
• Both voluntary and reflex movements
• Provides sensory information– Sight– Sound– Smell– Taste– Touch
• Two divisions: 1. Sympathetic2. Parasympatheitic
• Controls involuntary functions (glands, organs, blood vessels)– heartbeat– respiration– perspiration– digestion
• Can be influenced by thought and emotion (stress!)
• Defensive “ Fight or flight” response
• Releases adrenaline and noradrenaline
• Increases heart rate and blood pressure
• Increases blood flow to skeletal muscles
• Inhibits digestive functions
CENTRAL NERVOS SYSTEMBrain
Spinalcord
SYMPATHETIC
Dilates pupil
Stimulates salivation
Relaxes bronchi
Accelerates heartbeat
Inhibits activity
Stimulates glucose
Secretion of adrenaline,nonadrenaline
Relaxes bladder
Stimulates ejaculationin male
Sympatheticganglia
Salivaryglands
Lungs
Heart
Stomach
Pancreas
Liver
Adrenalgland
Kidney
• Opposite, “Rest and digest” system
• Calms body to conserve and maintain energy
• Lowers heartbeat, breathing rate, blood pressure
CENTRAL NERVOUS SYSTEMBrain
PARASYMPATHETIC
Spinalcord
Stimulates salivation
Constricts bronchi
Slows heartbeat
Stimulates activity
Contracts bladder
Stimulates erectionof sex organs
Stimulates gallbladder
Gallbladder
Contracts pupil
Autonomic nervous system controls physiological arousal
Sympatheticdivision (arousing)
Parasympatheticdivision (calming)
Pupils dilate EYES Pupils contract
Decreases SALVATION Increases
Perspires SKIN Dries
Increases RESPERATION Decreases
Accelerates HEART Slows
Inhibits DIGESTION Activates
Secrete stresshormones
ADRENALGLANDS
Decrease secretionof stress hormones
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