01:377:310 Lecture Notes - Lecture 4: Central Nervous System, Alpha Motor Neuron, Intrafusal Muscle Fiber

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Concept: the neuromotor system forms the foundation for the control for movement. Components of the central nervous system (cns) and peripheral nervous system (pns) involved in the control of coordinated movement. Range in size from 4 to 100 microns. Extensions from cell body- range from none to thousands per neuron. Extension from cell body- one per neuron with branches (known as collaterals) Types and functions of neurons: sensory neurons. Send information to cns from sensory receptors. Cell body and most of the axon located in pns; only axon central process enters cns: motor neurons. Predominantly in spinal cord- axons synapse on skeletal muscles. In intrafusal fibers of skeletal muscles: interneurons. Specialized neurons that originate and terminate in the brain or spinal cord. Axons from the brain and synapse on motor neurons. Axons from sensory nerves and the spinal nerves ascending to the brain. An alpha motor neuron and all the skeletal muscle fibers it innervates.

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