Question

I am contracting my biceps Brachii. Explain how that signal starts in my brain, what tract it might use and the neurons involved

Answer 1

The part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles is called somatic nervous system.

The basic route of nerve signals within the efferentsomatic nervous system involves a sequence that begins in upper motor neurons within the precentral gyrus.These stimuli are conveyed from upper motor neurons through the ventral horn of the spinal cord, and then, across synapses to be received by the sensory receptors of alpha motor neurons of the brainstem and spinal cord.Upper motor neurons release a neurotransmitter, which are received by nicotinic receptors of the alpha motor neurons.Acetylcholine is released from the axon terminal knobs of alpha motor neurons and received by postsynaptic receptors of muscles which results in relaying the stimulus to contract muscle fibers.

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