Final answer:
The basal ganglia and cerebellum provide input to the supplementary motor area (SMA) proper and pre-SMA, as these structures are key players in movement control and coordination.
Step-by-step explanation:
The cortical structures that provide input to the supplementary motor area (SMA) proper and pre-SMA are the basal ganglia and cerebellum. The basal ganglia are responsible for assessing cortical movement commands and influencing movement likelihood through modulatory activity. Damage to these structures can lead to motor dysfunctions as seen in conditions like Parkinson's disease. Similarly, the cerebellum plays a crucial role in movement coordination and precision. It is not the thalamus and hippocampus or other options like the amygdala and hypothalamus or hippocampus and basal ganglia that play the primary role in providing input to the SMA proper and pre-SMA.