reflex and autonomic nervous system the peripheral nervous system
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Reflex and autonomic Reflex and autonomic nervous systemnervous system
The peripheral nervous systemThe peripheral nervous system
RememberRemember
The nervous system is The nervous system is divided into 2 portionsdivided into 2 portions The central nervous systemThe central nervous system The peripheral nervous systemThe peripheral nervous system
The 2 systems are connectedThe 2 systems are connected 12 pairs of cranial nerves 12 pairs of cranial nerves
connect with the brainconnect with the brain 31 spinal nerves connect CNS 31 spinal nerves connect CNS
to the rest of the body.to the rest of the body.
NervesNerves Bundles of axons & dendrites of Bundles of axons & dendrites of
neurons.neurons. Spinal nerves have:Spinal nerves have:
A dorsal rootA dorsal root: caries messages TO : caries messages TO CNS from sensory receptorsCNS from sensory receptors
A ventral rootA ventral root: Carries messages : Carries messages FROM CNS to motor neurons.FROM CNS to motor neurons. Carry massage to muscles and glands Carry massage to muscles and glands
Interneurons: relay information Interneurons: relay information between neurons. between neurons.
Sensory division Sensory division
Has sensory receptors that collect Has sensory receptors that collect information form internal and external information form internal and external environments.environments.
The information is passed on to the The information is passed on to the central nervous system.central nervous system.
Pair share: name 2 things that the sensory receptors might collect from the internal and external environment.
Motor divisionMotor division
The body’s way of The body’s way of reacting to the sensory reacting to the sensory information.information.
Has independent Has independent systems:systems: SomaticSomatic Autonomic Autonomic
Somatic nervous systemSomatic nervous system
Controls the movement of Controls the movement of skeletal muscles.skeletal muscles.
Has both Has both voluntaryvoluntary and and involuntaryinvoluntary components. components. Voluntary is under conscious Voluntary is under conscious
controlcontrol Involuntary maintains balanceInvoluntary maintains balance
Includes Includes reflexesreflexes: signals that go to : signals that go to the spinal column but not the brain.the spinal column but not the brain.
Pair share: Give a reason why it is important for the body to have both voluntary and involuntary functions of the nervous system .
Autonomic Nervous Autonomic Nervous SystemSystem
Controls internal Controls internal organs and glands, organs and glands, everything that is everything that is involved in involved in maintaining maintaining homeostasis.homeostasis. Ex: heart beat, pupils Ex: heart beat, pupils
of the eye, blood of the eye, blood vessels, and adrenal vessels, and adrenal glands.glands.
Subdivisions of the Subdivisions of the Autonomic systemAutonomic system
SympatheticSympathetic: stimulates the body (stress : stimulates the body (stress response).response). Example: redirects blood from digestive Example: redirects blood from digestive
system to muscles and heartsystem to muscles and heart
ParasympatheticParasympathetic: maintains body under : maintains body under normal conditions. normal conditions. Example: signals body to return to normal Example: signals body to return to normal
activity activity
White board ReviewWhite board Review1.1. What are the 2 What are the 2
sections of the sections of the peripheral nervous peripheral nervous systemsystem
2.2. What does the What does the somatic nervous somatic nervous system regulate?system regulate?
3.3. What is the difference What is the difference between the between the sympathetic and sympathetic and parasympathetic parasympathetic divisions of the divisions of the autonomic system?autonomic system?
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