100CNervous

100CNervous - Nervous System Gathers information about the...

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Nervous System Gathers information about the body’s condition and the external environment, processes and integrates that information, and issues commands to the body’s muscles and glands
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Overview Central Nervous System (CNS) —brain and spinal cord—integrates information from many sensory neurons Peripheral Nervous System —nerves that communicate motor and sensory signals between CNS and the rest of the body i.e. all components of the nervous system outside the CNS Sensory receptors —e.g. for sight, hearing, touch Sensory input —information form outside stimuli, relayed through sensory neuron Integration —information interpreted, and associated with appropriate response in the body Motor output —conduction of signals from integration center to effector Effector —muscle or gland that carries out the body’s response to stimuli
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Neurons Neurons fundamental unit of the nervous system; individual cells that carry information 1) sensory neurons —receive information from internal environments (e.g. blood pressure, blood CO 2 level, muscle tension) and external environments (e.g. light, sound, touch, heat, smell, and taste) and pass signals to the CNS 2) interneurons —within CNS —form synapses with motor and sensory neurons, and integrate sensory input and motor output 3) motor neurons —transmit signals from CNS to muscles or glands (i.e. effectors)
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Simple Circuit inter White matter Gray matter Composed of myelinated axons Composed of dendrites, unmyelinated axons and nueuron cell bodies
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How Does Information Flow through the Nervous System? The brain integrates sensory information and sends signals to effector cells. Sensory neuron Sensory receptor CNS (brain + spinal cord) Interneuron Motor neuron (part of PNS) Effector cells
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How Does Information Flow through the Nervous System? When reflexes occur, sensory information bypasses the brain. Sensory receptor Motor neuron Effector cells Sensory neuron Spinal cord Interneuron
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Reflex Arc—knee- jerk response 1) Patellar ligament is tapped and stretches the Quadraceps muscle 2) Information travels down the axon of a sensory neuron to the spinal cord 3) In the spinal cord, information is transferred at the synapse to a motor neuron 4) The motor neuron carries information back to the muscle causing the quadriceps (extensor) to contract 5) An interneuron receives information from the sensory neuron, and inhibits the hamstring (flexor) muscle from contracting (extensor) (flexor)
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How Does Information Flow in a Neuron? Information flow through neurons Nucleus Dendrites Collect electrical signals Cell body Integrates (and can receive) incoming signals and generates outgoing signal to axon Contains nucleus and organelles Axon Passes electrical signals to dendrites or cell body of another cell or to an effector Cell (2mm-1M) Synaptic Terminal End of axon where signals are transferred to next cell
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Neuron? Neurons form networks for information flow
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100CNervous - Nervous System Gathers information about the...

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