Kinesiology 3480A/B Lecture Notes - Lecture 3: Central Nervous System, Alpha Motor Neuron, Myelin

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The nervous system is comprised of both the central nervous system (cns) which includes the brain and spinal cord, along with the. The pns carries info to the cns from our senses and from the cns to the skeletal muscles (muscle spindles/extrafusal muscle fibers, and the vestibular system). The cerebral cortex (or cortical structures) tells everyone what to do. There are 86 billion neurons in the human brain and 13 billion in monkeys. The sub-cortical structures are second in command and can relay and/or modify signals from the cerebral cortex. They include the basal ganglia, the thalamus, pons, and cerebellum. Brainstem is third in command, after which signals are passed to the spinal cord. The brain sends and receives info to and from the spinal cord. Motor neurons are in the spinal cord and enable movement (innervate extrafusal muscle fibers).

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