Control Subsystem

Control Subsystem - AWESOME InteractiveSpine(c) The Nervous System Is there a need for control coordination BIG PICTURE of the NS 1 receives

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AWESOME!!
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The Nervous System Is there a need for control, coordination? BIG PICTURE of the NS: 1) receives information from internal/external environment (sensory, receptors, afferent) 2) processes information (decision making) 3) response (motor, effectors, efferent)
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The two parts to the NS: a) CNS CNS - brain and spinal cord b) PNS PNS - nerves and ganglia Nerves - PNS is formed by nerves (bundles of nerve fibers (axons) carrying info to and from CNS Ganglia - Collections of nerve cell bodies outside CNS Two classes of NS cells: Nerve cells (neurons) - functional unit of NS, neuron theory Glia - > 10:1 ratio (neurons), support, myelin, plasticity? synapses? [notes have types]
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Basic organization or Ņwi ringÓ of our nervous system: CNS Brain Spinal Cord PNS There are 31 pairs of spinal nerves and 12 pairs of cranial nerves AFFERENT EFFERENT (Sensory System) (Motor System) Conveys information from Conveys information from Receptors to the CNS CNS to muscles and glands Visceral and Somatic Sensory Somatic Motor Autonomic NS Conveys info. Conveys info. from from CNS to CNS to smooth skeletal muscle & cardiac muscle & glands Sympathetic Parasympathetic
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Neurons Single nerve cell consisting of a cell body and one or more projections Excitability Conductivity Secretion Fig 4.1 Receptive Segment Conductile Segment
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Classes of Neurons
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Motor Neurons Situated in anterior horns of spinal cord Dendrite that synapse with sensory neurons Axon emerges from spinal cord, travels by way of a peripheral nerve to muscle Each terminal branch ends at the motor end plate of a single muscle fiber
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Sensory Neurons Situated in a dorsal root ganglion just outside the spinal cord Neuron may terminate in spinal cord or brain A long peripheral fiber comes from a receptor Fig 4.1b
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Connector (Inter-) Neurons Exist completely within the CNS Serve as connecting links May be a single neuron, connecting sensory to motor neurons Form complex connections, receive input from: a) each other, b) incoming sensory afferents, c) descending fibers from higher centers
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Spinal Cord Anatomy Spinal Cord Functions : carries messages to and from the brain (to and from the body), generates rhythmic component of locomotor movements that are normally controlled by the brain, organizes some reflexes ascending tracts: somatosensory => brain descending tracts: motor-control => body Tracts = bundles of axons in CNS Brain and spinal cord made of gray matter and white matter gray matter - cell bodies white matter - tracts form the white matter
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Spinal Cord Anatomy The spinal cord, part of the central nervous system, is the information highway between the brain and trunk and limbs. Spinal nerves are part of the peripheral nervous system.
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This note was uploaded on 08/28/2011 for the course KNH 244 taught by Professor Smith during the Fall '07 term at Miami University.

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Control Subsystem - AWESOME InteractiveSpine(c) The Nervous System Is there a need for control coordination BIG PICTURE of the NS 1 receives

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