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organogenesis

 
Dictionary: or·gan·o·gen·e·sis   (ôr'gə-nō-jĕn'ĭ-sĭs, ôr-găn'ə-) pronunciation
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n., pl., -ses (-sēz').
The formation and development of the organs of living things.

organogenetic or'gan·o·ge·net'ic (-jə-nĕt'ĭk) adj.
organogenetically or'gan·o·ge·net'i·cal·ly adv.

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Dental Dictionary: organogenesis
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(ôr′gənōjen′əis)
n

The formation of organs within an embryo. Organogenesis occurs within the first trimester.

Medical Dictionary: or·gan·o·gen·e·sis
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Home > Library > Health > Medical Dictionary
(ôr'gə-nō-jĕn'ĭ-sĭs, ôr-găn'ə-)
n.

The formation and development of the organs of living things. Also called organogeny.

or'gan·o·ge·net'ic (-jə-nĕt'ĭk) adj.
Wikipedia: Organogenesis
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In animal development, organogenesis (organo-genesis, compound of the Greek words όργανον "that with which one works"[1], and γένεσις "origin,creation,generation"[2]) 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.

Contents

Production

The endoderm produces tissue within the lungs, thyroid, and pancreas. The mesoderm aids in the production of cardiac muscle, skeletal muscle, smooth muscle, tissues within the kidneys, and red blood cells. The ectoderm produces tissues within the epidermis and aids in the formation of neurons within the brain, and melanocytes.
Organs derived from each germ layer. Image from NCBI.

The proceeding graph represents the products produced by the three germ layers.

Germ Layer Category Product
Endoderm General[3] Gastrointestinal tract
Endodern General Respiratory tract
Endoderm General Endocrine glands and organs (liver and pancreas)
Mesoderm General Bones
Mesoderm General Most of the Circulatory system
Mesoderm General Connective tissues of the gut and integuments
Mesoderm General Excretory Tract
Mesoderm General Mesenchyme
Mesoderm General Mesothelium
Mesoderm General Muscles
Mesoderm General Peritoneum
Mesoderm General Reproductive System
Mesoderm General Urinary System
Mesoderm Vertebrate[4] Chordamesoderm
Mesoderm Vertebrate Paraxial mesoderm
Mesoderm Vertebrate Intermediate mesoderm
Mesoderm Vertebrate Lateral plate mesoderm
Ectoderm General Nervous system
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 Melanocytes
Ectoderm Vertebrate Peripheral nervous system
Ectoderm Vertebrate Facial cartilage
Ectoderm Vertebrate Dentin (in teeth)
Ectoderm Vertebrate Brain (rhombencephalon, mesencephalon and prosencephalon)
Ectoderm Vertebrate Spinal cord and motor neurons
Ectoderm Vertebrate Retina
Ectoderm Vertebrate Posterior pituitary

See also

Notes

  1. ^ Definition of organ from the Online Etymology Dictionary
  2. ^ Definition of genesis from the Online Etymology Dictionary
  3. ^ The General category denotes that all or most of the animals containing this layer produce the adjacent product.
  4. ^ The Vertebrate category denotes that all or most of the vertebrates containing this layer produce the adjacent product.

References

Search Wiktionary 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.
v • d • e
Developmental biology > Human embryogenesis (development of embryo) and development of fetus
First three
weeks
Week 1
Week 2
(Bilaminar)
Week 3
(Trilaminar)
Extraembryonic/
uterus
Histogenesis
Organogenesis
(Some dates are approximate—see Carnegie stages and a timeline.)
v • d • e
Germ layers
Germ Layers
Production
Histogenesis • Organogenesis

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

 
 

 

Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Dental Dictionary. Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved.  Read more
Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Organogenesis".  Read more