Compilation of free information about human parts, their function, assembly, repair, and maintenance
Ectoderm
| Ectoderm | |
|---|---|
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| Organs derived from ectoderm. | |
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| Section through embryonic disk of Vespertilio murinus. | |
| Gray's | subject #6 48 |
| MeSH | Ectoderm |
The ectoderm is the start of a tissue that covers the body surfaces. It emerges first and forms from the outermost of the germ layers.
What forms from it (general)?
- Nervous system
- Outer part of integument
What forms from it (vertebrates)?
In vertebrates, the ectoderm has three parts: external ectoderm, the neural crest, and neural tube.
- External Ectoderm
- skin (along with glands, hair, nail (anatomy))
- epithelium of the mouth and nasal cavity
- Epithelium of pineal and pituitary glands
- lens and cornea of the eye
- Apical Ectodermal Ridge inducing development of the limb buds of the embryo.
- Sensory receptors in epidermis
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Neural crest
- pigment cells in the skin
- ganglia of the autonomic nervous system
- dorsal root ganglia.
- schwann cells
- facial cartilage
- dentin (in teeth)
- spiral septum of developing heart
- ciliary body of the eye.
- Neural Tube
- Adrenal Medulla
Additional images
 Section through ovum imbedded in the uterine decidua
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References
- Evers, Christine A., Lisa Starr. Biology:Concepts and Applications. 6th ed. United States:Thomson, 2006. ISBN 0-534-46224-3.
See also
| Mammalian development of embryo and development of fetus (some dates are approximate - see Carnegie stages) |
|---|
| Week 1:
Zygote -
Morula -
Blastula/Blastomere/Blastosphere
-
Archenteron/Primitive
streak -
Blastopore -
Allantois -
Trophoblast (Cytotrophoblast
-
Syncytiotrophoblast -
Gestational sac)
Week 2: Yolk sac - Vitelline duct - Bilaminar disc Week 3: Hensen's node - Gastrula/Gastrulation - Trilaminar embryo Branchial arch (1st) - Branchial pouch - Meckel's cartilage - Somite/Somitomere - Sclerotome - Myotome - Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm, Splanchnopleure, Somatopleure) Histogenesis and Organogenesis Uterine support: Placenta - Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) - Amniotic sac (Amnion, Chorion) |
The content of this section is licensed under the GNU Free Documentation License (local copy). It uses material from the Wikipedia article "Ectoderm" modified April 14, 2007 with previous authors listed in its history.
