Curvatures of the stomach to its anterior portion are attached the two layers of the greater omentum, separated from each other by the gastroepiploic vessels. There are three arteries which primarily supply the greater curvature: and the gastroepiploic vessels: The lesser curvature of the stomach, extending between the cardiac and pyloric orifices, forms the right or medial border of the stomach. It descends as a continuation of the right margin of the esophagus in front of the fibers of the right crus of the diaphragm, and then, turning to the right, it crosses the first lumbar vertebra and ends at the pylorus. Nearer its
Embryological origins of the mouth and anus that the structures are equivalent homologous, and that the older ideas about protostome mouth formation were correct. An alternative way to develop two openings from the blastopore during gastrulation, called amphistomy, appears to exist in some animals, such as nematodes. In many animals these early development stages later evolved in ways that no longer reflect these original patterns. For instance, humans have already formed a gut tube at the time of formation of the mouth and anus. Then the mouth is formed first, during the fourth week of development, and the anus is created four weeks later, temporarily forming a