Q. Which are the kinds of neurons that participate in the spinal arch reflex? Where are their cell bodies situated?

In the arch reflex first a sensory neuron located in the ganglion of a dorsal spinal root collects the stimulus information from the tissues this sensory neuron makes indirect or direct (through interneurons) connection with inferior motor neurons of the spinal cord. These motor neurons then command the reflex reaction so sensory neurons, inferior and interneurons motor neurons participate in the arch reflex.