What is an endoderm?

Endoderm or Encoderm is one of the three embryonic layers of germs, which together lead to all mature tissues and body organs. From the inside out there are three cell layers endoderm, mesoderm and ectoderm. Cell layers are formed at the beginning of embryonic development, when the cavity was called archenterone forms in the center of Blastula, a small ball of undifferentiated cells, and cells begin to reorganize into the germ layers. Endoderm is the first to form and begins to form in a human embryo about two weeks after fertilization. By the fifth week, the endoderm has already been distinguished into organs.

Three cell layers are roughly equivalent to the structures in a fully formed human body, with an endoderm being an internal structures, ectoderm forming external structures and mesoderm forming intermediate structures such as skeleton, skeletal muscles and hearts. Some animals lack mesoderm. Archenterone is an integrd of the intestine or digestive tract and its appearance indicates the beginning of the formation of germLayers, which is a process called gastric.

Endoderm cells are initially flat, but they become columnar and their height exceeding their width, as they are distinguished. Finally, they come into the creation of lining the digestive system in the human body, with the exception of parts of the mouth, neck and rectum. Endoderm also causes most of the inner epithelial tissue that lines organs and glands.

Endoderm also forms the airways in the lungs: trachea, bronchi and alveoli. It balances all glands that open into the digestive tube, including the pancreas and liver, as well as follicles of thymus, which produces T-lymphocytes or T-cells, and thyroids that produce a number of important regulatory hormones. This also leads to the epithelium of Ton Eustachian tube and the tympanic cavity in the ear and the bladder and urethra.