Final answer:
Intermediate filaments are not associated with the microfilaments supporting microvilli in intestinal cells; microvilli contain actin microfilaments that help in maintaining their structure.
Step-by-step explanation:
Intermediate filaments are not associated with the bundle of microfilaments supporting each microvillus in small intestine mucosal cells. Microvilli are closely associated with microfilaments that aid in maintaining their structure and are responsible for the brush border appearance. These microfilaments are primarily composed of actin and are fundamental in various cellular functions including maintenance of cell shape and support for cell projections such as microvilli.