Final answer:
The specialized lymph capillaries found within the villi of the intestinal mucosa are called lacteals, and they play a critical role in the absorption of fatty acids and fat-soluble vitamins into the lymphatic system.
Step-by-step explanation:
The highly specialized lymph capillaries that are present in the villi of the intestinal mucosa are called lacteals. These lymphatic vessels are crucial in the absorption of nutrients, particularly the fats from digested food. Each villus in the small intestine contains a network of blood capillaries and a central lacteal. While blood in the capillaries absorbs most nutrients like sugars and amino acids, lymph in the lacteals absorbs fatty acids and fat-soluble vitamins (vitamins A, D, E, and K), forming a milky fluid known as chyle. This is then transported from the small intestine to the bloodstream via the lymphatic system, playing a vital role in the digestive function of the lymphatic system.