The Origin of the pancreas. Disclosure 15
The pancreas secretes digestive enzymes which go to the small intestine, and hormones such as insulin and glucagon, which go to blood. Its study is important because its function affects the digestion of fats and carbohydrates and both affect the energy efficiency of food for poultry and pigs.
Two aspects will be distinguished: the embryological origin and phylogenetic origin.
From the embryological point of view the pancreas develops in the first quarter of embryonic life from endodermal lining of the duodenum and splannic mesoderm by the differentiation of two buds. The ventral bud is related to the common bile duct and the dorsal yolk-related glandular function which in turn will produce amylase and lipase.
From the phylogenetic point of view highlight the doctoral thesis of Edwin A. Baumgartner in 1915 entitled "Development of the liver and pancreas in Amblystoma punctatum." This is a live amphibian that presents an evolution of the mesenteric glands originates primitives in parallel or shortly after the stomach, as an outgrowth of the intestine in a Devonian period between 251 and 60 million years ago. This process is linked with the phenomenon described by Van Den Hoek in 1966 in lamellibranch 525 to 500,000,000 years ago in the Cambrian period.
It is therefore an organ derived from intestinal tissue and therefore after the same but as old as the liver .Pancreas appeared (500 million years ago) by the need to process through the enzymes produced by it , the more complex substances digested and absorbed by the primitive gut. It is possible that the hormone-producing area was later developed (250 million years ago) to mobilize the reserves of glucose from the liver.