painpathway and morphine

Explain pain pathway and 3 types of pain pathway  2 sentence each for 1st order neuron noceceptors  2nd order neuron spinothalamic  and 3rd order neuron . Then describe the image below peripheral tissue to spinal cord to thalamus to cerebral cortex maximum 120 words. And  how morphine alters the conscious percept of pain 80 words total 200 words .no need of reference.  Try to use the information from the picture below so that i can put the reference