Final answer:
Peyer's patches are isolated clusters of lymph follicles in the wall of the small intestine that play a crucial role in immune surveillance and the prevention of bacterial growth in the intestines.
Step-by-step explanation:
The isolated clusters of lymph follicles found in the wall of the small intestine are known as Peyer's patches. These are important components of the gut-associated lymphoid tissue (GALT) which play a critical role in the immune response by monitoring intestinal bacteria populations and preventing the growth of pathogenic bacteria in the intestines. The Peyer's patches are most prominent in younger individuals and are a part of what is collectively referred to as mucosa-associated lymphoid tissue (MALT), located in the lamina propria of the mucosal lining.