In animal development, organogenesis is the process by which the ectoderm, endoderm, and mesoderm develop into the internal organs of the organism. Internal organs initiate development in humans within the 3rd to 8th weeks in utero.The germ layers in organogenesis differ by three processes: folds, splits, and condensation. Developing early during this stage in chordate animals are the neural tube and notochord. Vertebrate animals all differentiate from the gastrula the same way. Vertebrates develop a neural crest that differentiates into many structures, including some bones, muscles, and components of the peripheral nervous system. The coelom of the body forms from a split of the mesoderm along the somite axis.
The proceeding graph represents the products produced by the three germ layers.
|Endoderm||General||Endocrine glands and organs (liver and pancreas)|
|Mesoderm||General||Most of the Circulatory system|
|Mesoderm||General||Connective tissues of the gut and integuments|
|Mesoderm||Vertebrate||Lateral plate mesoderm|
|Ectoderm||General||Outer part of integument|
|Ectoderm||Vertebrate||Skin (along with glands, hair, nails)|
|Ectoderm||Vertebrate||Epithelium of the mouth and nasal cavity|
|Ectoderm||Vertebrate||Lens and cornea of the eye|
|Ectoderm||Vertebrate||Peripheral nervous system|
|Ectoderm||Vertebrate||Dentin (in teeth)|
|Ectoderm||Vertebrate||Brain (rhombencephalon, mesencephalon and prosencephalon)|
|Ectoderm||Vertebrate||Spinal cord and motor neurons|
- Eye development
- Germ layer
- Germ line development
- Heart development
- Limb development
|40x40px||Look up organogenesis in Wiktionary, the free dictionary.|
- Evers, Christine A., Lisa Starr. Biology:Concepts and Applications. 6th ed. United States:Thomson, 2006. ISBN 0-534-46224-3.