What structure but I assumed to be compromised if a pt tell me they have "tingling and numbness?

The nervous system. this is because that is where u touch and feel. if u are experiencing numbness and tingling there is where ur focus should be

between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.