Echinodermata, Hemichordata and Xenoturbellida form the clade Ambulacraria. The present phylum Priapulida also has a deuterostomic development, despite being otherwise placed within the protostomes. In both deuterostomes and protostomes, a zygote first develops into a hollow ball of cells, called a blastula.In deuterostomes, the early divisions occur parallel or perpendicular to the polar axis. This is called radial cleavage, and also occurs in certain protostomes, such as the lophophorates.chinodermata, Hemichordata and Xenoturbellida form the clade Ambulacraria. The present phylum Priapulida also has a deuterostomic development, despite being otherwise placed within the protostomes. In both deuterostomes and protostomes, a zygote first develops into a hollow ball of cells, called a blastula.
In this test you drink some barium liquid. The barium liquid is often fruit-flavoured so it is pleasant to drink. You stand in front of an X-ray machine whilst X-ray pictures are taken as you swallow. This test aims to look for problems in the gullet (oesophagus).
Barium swallow is a type of upper GI series; the endoscopy x-ray happens the same way, but is limited to the pharynx and esophagus.Barium swallow is not designed to detect issues with a patientâs stomach and small intestine.The procedure involves drinking a barium contrast solution and using a special kind of x-ray referred to as fluoroscopy is used to capture moving images of the patientâs upper GI tract.During the procedure, patients will need to ingest a thick, white and chalky barium solution.he procedure involves drinking a barium contrast solution and using a special kind of x-ray referred to as fluoroscopy is used to capture moving images of the patientâs upper GI tract. During the procedure, patients will need to ingest a thick, white and chalky barium solution.