Final answer:
Microvilli are small cylindrical extensions of the plasma membrane that greatly increase surface area. In neurons, dendrites provide a similar benefit by branching out and increasing surface area for synaptic connections.
Step-by-step explanation:
Microvilli are small cylindrical extensions of the plasma membrane that greatly increase the surface area of absorptive cells. In neurons, dendrites provide a comparable benefit by branching out and increasing the surface area for possible synaptic connections. Dendritic spines, small protrusions on dendrites, further increase the surface area for synaptic connections.