Essay on Human Anatomy and Physiology: Tracing a Nerve Impulse

(Part one) Trace the impulse, listing the steps in as much detail as possible, from which your brain sends the message to the appropriate muscles to step up one step. Specifically include the steps involved in transmitting the impulase from the neuron to the muscle fiber at the neuromuscular junction. Specify which muscles are pulling on which bones and what type of joints are involved.

The starting point of a voluntary movement impulse is the Central Nervous System (CNS), which includes the brain and the spinal cord. For example, a typical movement may be initiated in the motor cortex of the forebrain, later transmitted downwards through the brain stem into the spinal cord and from the latter to the Peripheral Nervous System (PNS), which connects between the CNS and the organs. Both systems function as sensory as well as motor control mechanisms; this review, however, focuses merely on voluntary motor control. Continue reading