Production
The following chart shows the products produced by the endoderm.
| Layer | Category | System | |
|---|---|---|---|
| General | Gastrointestinal tract. | the entire alimentary canal except part of the mouth, pharynx and the terminal part of the rectum (which are lined by involutions of the ectoderm), the lining cells of all the glands which open into the digestive tube, including those of the liver and pancreas | |
| General | Respiratory tract | the trachea, bronchi, and alveoli of the lungs | |
| General | Endocrine glands and organs | the lining of the follicles of the thyroid gland and thymus | |
| Auditory system | the epithelium of the auditory tube and tympanic cavity | ||
| Urinary system | the urinary bladder and part of the urethra |
Liver and pancreas cells are believed to derive from a common precursor.
In humans,the endoderm can differentiate into distinguishable organs after 5 weeks of embryonic development.
Read more about this topic: Endoderm
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