What is the anatomy of an alpha motoneuron

What is the anatomy of an alpha motoneuron? What is myelin around a specific region so important? What is transmitted and from where? Where does it bind?

• After a signal is transmitted to the post-synaptic cell provide the cascade of events that has to occur before muscle contraction (Include role in sequential steps from innervation of the action potential to contraction: HINT role of ATP, Power stroke, Ca+ involvement on the thin proteins etc etc.
• What is an alpha motor neuron and a gamma motor neuron? How do they differ? What proprioceptor is very important here?
• Please give a detailed example of the sensory motor integration that would occur in the brain from the nociceptors. What is the sensory side? Integration in what region of the brain followed by the motor response)