Ms Sallo AP Psychology March 8 2016 Peripheral Nervous System PNS Def made up of all those nerves that lie outside the brain and spinal cord Nerves are bundles of axons that are routed together in the PNS ID: 784630
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Slide1
Peripheral Nervous System
Ms. Sallo
AP
Psychology
March 8, 2016
Slide2Peripheral Nervous System (PNS)
Def: made up of all those nerves that lie outside the brain and spinal cord.
Nerves are bundles of axons that are routed together in the PNS
Divided into the Somatic nervous system and the autonomic nervous system
Slide3Somatic Nervous System
Def: made up of nerves that connect to voluntary skeletal muscles and to sensory receptors
Carry information from receptors in the skin, muscles and joints to the CNS and carry commands from the CNS to the muscles.
Control voluntary behaviors
All afferent neurons are sensory
All efferent neurons exten
d
to the muscles (motor)
Slide4Autonomic Nervous System (ANS)
Def: made up of nerves that connect to the heart, blood vessels, smooth muscles and glands
Controls involuntary behavior
No need to think
Separated in 2 division
Sympathetic and parasympathetic
Slide5ANS (Cont.)
Sympathetic Division- active in stressful situations (fight or flight)
Used for emergencies, accelerates heart r
ate, respiration, blood pressure
Slows digestion and drains blood lessening bleeding
Parasympathetic division- relaxing state
Conserves bodily resources and stores energy
Slow heart rate, reduce blood pressure, promote digestion
Slide6PNS
Autonomic
Somatic
Sympathetic
Parasympathetic