Gram-positive and gram-negative bacteria exhibit distinct flagellar basal body configurations due to structural cell wall variations. In both types, a hook connects the external filament to a rod that links to the basal body in the inner membrane, which consists of a C-ring, an MS-ring, stators, and a type III secretion protein. Because gram-negative bacteria have an outer membrane and a periplasmic space, their flagellar configuration additionally includes an L-ring in the outer membrane and a P-ring in the cell wall.