Final answer:
The trigeminal 3rd Order Neurons originate in the thalamus and project to the primary somatosensory cortex of the cerebrum.
Step-by-step explanation:
The trigeminal system in the head and neck carries somatosensory information from the face. It consists of three successive neurons.
The third-order neurons of the trigeminal pathway originate in the thalamus and project their axons to the primary somatosensory cortex of the cerebrum.