After the Sensory Neurons of a Somatosensory Pathway Enter the Dorsal

Short Answer

After the sensory neurons of a somatosensory pathway enter the dorsal root,the [dropdown 1] extend from the posterior gray horn of the spinal cord and synapse with [dropdown 2] in the thalamus.
Dropdown choices:
first order neurons
second order neurons
third order neurons
preganglionic neurons
motor neurons
postganglionic neurons
efferent neurons