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Ectoderm
Image:Ectoderm.png
Organs derived from ectoderm.
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.

Contents 1 What forms from it (general)? 2 What forms from it (vertebrates)? 3 Additional images 4 References 5 See also

[edit] What forms from it (general)?

• Nervous system
• Outer part of integument

[edit] 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
  • lens and cornea of the eye
  • Apical Ectodermal Ridge inducing development of the limb buds of the embryo.

• 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
  • brain (rhombencephalon, mesencephalon and prosencephalon)
  • spinal cord and motor neurons
  • retina
  • posterior pituitary

[edit] Additional images

Section through ovum imbedded in the uterine decidua

[edit] References

• Evers, Christine A., Lisa Starr. Biology:Concepts and Applications. 6th ed. United States:Thomson, 2006. ISBN 0-534-46224-3.

[edit] See also

Mammalian development of embryo and development and fetus (some dates are approximate - see Carnegie stages) - edit - discuss
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 | Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm)
Histogenesis and Organogenesis
Circulatory system: Primitive atrium | Primitive ventricle | Bulbus cordis | Truncus arteriosus | Ostium primum | Foramen ovale | Ductus venosus | Ductus arteriosus | Aortic arches | Septum primum | Septum secundum | Cardinal veins Nervous system: Neural development/Neurulation | Neurula | Neural folds | Neural groove | Neural tube | Neural crest | Neuromere (Rhombomere) | Notochord | Optic vesicles | Optic stalk | Optic cup Digestive system: Foregut | Midgut | Hindgut | Proctodeum | Rathke's pouch | Septum transversum Urinary/Reproductive system: Urogenital folds | Urethral groove | Urogenital sinus | Kidney development (Pronephros | Mesonephros | Ureteric bud | Metanephric blastema) | Fetal genital development (Wolffian duct | Müllerian duct | Gubernaculum | Labioscrotal folds) Glands: Thyroglossal duct Uterine support: Placenta | Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) | Amniotic sac (Amnion, Chorion) Limb development: Limb bud | Apical Ectodermal Ridge/AER

Germ Layers - edit
Germ Layers: Ectoderm | Endoderm | Mesoderm Production: Histogenesis | Organogenesis

cs:Ektoderm

de:Ektoderm es:Ectodermo eo:Ektodermo fr:Ectoderme it:Ectoderma he:שכבת נבט nl:Ectoderm pl:Ektoderma pt:Ectoderme ro:Ectoderm sv:Ektoderm tr:Ektoderm