Study of morphological structure in human fetus Wharton's duct opening area.

In this study, we confirmed that the Wharton's duct wall structure of nine month old fetuses was close to its adult structural formation, while the inner structure consisted of an ample distribution of elastic fibers and smooth muscle fibers. Based on the distribution pattern of the smooth muscle, we speculate that the Wharton's duct's opening area does not possess a sphincter-like function in the regulation of salivary flow.