Spinal Cord Brain Nerves PNS consists of 43 pairs of nerves that transmit info to and from CNS 12...
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![Page 1: Spinal Cord 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.](https://reader036.fdocuments.in/reader036/viewer/2022081816/56649f0e5503460f94c23164/html5/thumbnails/1.jpg)
![Page 2: Spinal Cord 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.](https://reader036.fdocuments.in/reader036/viewer/2022081816/56649f0e5503460f94c23164/html5/thumbnails/2.jpg)
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
![Page 3: Spinal Cord 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.](https://reader036.fdocuments.in/reader036/viewer/2022081816/56649f0e5503460f94c23164/html5/thumbnails/3.jpg)
Skeletal(Somatic)
Sympathetic Parasympathetic
Autonomic
Peripheral Nervous System
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• Controls movement of skeletal muscles
• Both voluntary and reflex movements
• Provides sensory information– Sight– Sound– Smell– Taste– Touch
![Page 5: Spinal Cord 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.](https://reader036.fdocuments.in/reader036/viewer/2022081816/56649f0e5503460f94c23164/html5/thumbnails/5.jpg)
• Two divisions: 1. Sympathetic2. Parasympatheitic
• Controls involuntary functions (glands, organs, blood vessels)– heartbeat– respiration– perspiration– digestion
• Can be influenced by thought and emotion (stress!)
![Page 6: Spinal Cord 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.](https://reader036.fdocuments.in/reader036/viewer/2022081816/56649f0e5503460f94c23164/html5/thumbnails/6.jpg)
• 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
![Page 7: Spinal Cord 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.](https://reader036.fdocuments.in/reader036/viewer/2022081816/56649f0e5503460f94c23164/html5/thumbnails/7.jpg)
• 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
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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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