The transmission of information from sensory neurons to interneurons typically involves the

The transmission of information from sensory neurons to interneurons typically involves the release of chemical messenger into space which is between the axon of the plasma membrane and sensory neuron of interneuron. 
Sensory neurons/afferent neurons are the neurons which convert the specific type of stimulus via their receptor into graded potential under a process called sensory transduction. 
Sensory neurons' cell bodies are located in dorsal ganglia of the spinal cord. Various types of sensory neurons have different sensory receptors which respond to various kinds of stimuli

The transmission of information from sensory neurons to inter-neurons typically involves the release of chemical messengers into the space between the axon of the sensory neuron and the plasma membrane of the interneuron. The sensory neurons receive impulses from the sensory organs and then carry them to the spinal cord or the brain (the central nervous system). The interneurons connect the sensory neurons and the motor neurons and they are tasked with interpreting the impulses.