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Published byGervase Summers Modified over 9 years ago
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Reflex and autonomic nervous system The peripheral nervous system
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Remember The nervous system is divided into 2 portions The central nervous system The peripheral nervous system The 2 systems are connected 12 pairs of cranial nerves connect with the brain 31 spinal nerves connect CNS to the rest of the body.
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Nerves Bundles of axons & dendrites of neurons. Spinal nerves have: A dorsal root: caries messages TO CNS from sensory receptors A ventral root: Carries messages FROM CNS to motor neurons. Carry massage to muscles and glands Interneurons: relay information between neurons.
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Sensory division Has sensory receptors that collect information form internal and external environments. The information is passed on to the central nervous system. Pair share: name 2 things that the sensory receptors might collect from the internal and external environment.
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Motor division The body’s way of reacting to the sensory information. Has independent systems: Somatic Autonomic
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Somatic nervous system Controls the movement of skeletal muscles. Has both voluntary and involuntary components. Voluntary is under conscious control Involuntary maintains balance Includes reflexes: signals that go to 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.
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Autonomic Nervous System Controls internal organs and glands, everything that is involved in maintaining homeostasis. Ex: heart beat, pupils of the eye, blood vessels, and adrenal glands.
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Subdivisions of the Autonomic system Sympathetic: stimulates the body (stress response). Example: redirects blood from digestive system to muscles and heart Parasympathetic: maintains body under normal conditions. Example: signals body to return to normal activity
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White board Review 1.What are the 2 sections of the peripheral nervous system 2.What does the somatic nervous system regulate? 3.What is the difference between the sympathetic and parasympathetic divisions of the autonomic system?
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