 Nearby and slightly above, a subsequent intestine part surfaces that has been interpreted as the jejunum.This thinner intestine turns to the back, running parallel to the ascending tract of the duodenum and ultimately disappearing under it, at the level of the twelfth dorsal vertebra.Apparently a loop to the front is made because it resurfaces below the tenth dorsal vertebra, first running upwards and then turning to the back below the hind vertebral column — or at places even over it