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Lesson 8. Nerve Action

2-8. NERVE ACTION

a. A stimulus acts upon a sensory receptor. The information is carried by an afferent (sensory) neuron through the merging branches of the spinal nerve that has been affected. The information is carried through the posterior root ganglion and posterior root to the spinal cord. Once the information reaches the spinal cord, it ascends the appropriate fiber tract to the designated area of the brain.

b. Motor information (commands) from the brain will descend along the appropriate fiber tract within the spinal cord until the appropriate spinal nerve is innervated. The efferent (motor) neurons carry the command from the spinal cord to the effector organ.

David L. Heiserman, Editor

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Revised: June 06, 2015