The precise demarcation involving the higher and lessen tracts would be the suspensory muscle of the duodenum. This differentiates the embryonic borders in between the foregut and midgut, and is also the division usually utilized by clinicians to describe gastrointestinal bleeding as currently being of possibly "higher" or "lower" origin. https://origemlab.com.br/teste-de-perfil-intestinal-completo/