Which intestinal roundworm migrates to the perianal skin to deposit embryonated eggs?

Enterobius vermicularis, commonly known as the pinworm, is the correct answer because this intestinal roundworm is characterized by its life cycle that involves the migration of adult females to the perianal region to deposit their eggs. This typically occurs at night, which is why the condition is often associated with nocturnal itching. The eggs then become embryonated and can be easily transmitted through hand-to-mouth contact, as they often cling to surfaces.

Ascaris lumbricoides, known as the large roundworm, primarily resides in the small intestine and does not migrate to the perianal skin to deposit eggs. Its life cycle involves the ingestion of eggs, development in the intestine, and subsequent migration through the lungs before returning to the intestine.

Strongyloides stercoralis, or threadworm, can cause autoinfection and has a complex life cycle, but it does not specifically migrate to the perianal area for egg deposition like Enterobius vermicularis.

Necator americanus, which is a hookworm, is also different in its lifecycle and method of transmission. Hookworms primarily enter through the skin of the feet rather than through the gastrointestinal tract and do not migrate to the perianal region.

Thus