ectoderm

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ectoderm

 [ek´to-derm]
the outermost of the three primary germ layers of the embryo; from it are derived the epidermis and epidermic tissues such as nails, hair, and glands of the skin; the nervous system; external sense organs such as the eye and ear; and the mucous membranes of the mouth and anus. adj., adj ectoder´mal, ectoder´mic.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ec·to·derm

(ek'tō-dĕrm),
The outer layer of cells in the embryo, after establishment of the three primary germ layers (ectoderm, mesoderm, endoderm), the germ layer in contact with the amnionic cavity.
Synonym(s): ectoblast (1)
[ecto- + G. derma, skin]
Farlex Partner Medical Dictionary © Farlex 2012

ectoderm

(ĕk′tə-dûrm′)
n.
1. The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and, in vertebrates, sense organs develop.
2. The outer layer of a diploblastic animal, such as a jellyfish.

ec′to·der′mal, ec′to·der′mic adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

ec·to·derm

(ek'tō-dĕrm)
The outer layer of cells in the embryo, after establishment of the three primary germ layers (e.g., ectoderm, mesoderm, endoderm).
Synonym(s): ectoblast (1) .
[ecto- + G. derma, skin]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ectoderm

The outermost of the three primary germ layers of an embryo, the others being the MESODERM and the ENDODERM. The ectoderm develops into the skin, the nervous system, and the sense organs.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

ectoderm

or

ectoblast

the germ layer lying on the outside of the developing embryo that eventually gives rise largely to the EPIDERMIS, but also to nervous tissue and, where present, nephridia (see NEPHRIDIUM). Compare ENDODERM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

ectoderm

The outermost of the three primary germinal layers of an embryo (the other layers being mesoderm and endoderm) from which the eye is derived. It differentiates into outer surface ectoderm and inner neuroectoderm, which gives rise to neural crest cells. The surface ectoderm gives rise to the crystalline lens, the lacrimal gland, the meibomian glands, the corneal and conjunctival epithelium and the epidermis of the eyelids. The neuroectoderm (neural ectoderm) will form the retina, retinal pigment epithelium, the pigmented and non-pigmented layers of the ciliary and iris epithelium, the dilator and sphincter muscles of the iris and the optic nerve fibres. Neural crest cells will form the corneal stroma and endothelium, sclera, iris and choroidal stroma, ciliary muscle and trabecular meshwork. See optic cup; mesoderm; optic vesicles.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

ec·to·derm

(ek'tō-dĕrm)
Outer layer of cells in the embryo, after establishment of the three primary germ layers (ectoderm, mesoderm, endoderm).
[ecto- + G. derma, skin]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The cornea comprises of the anterior epithelium (stratified squamous cells derived from the surface ectoderm), central stroma (a thick collagenous mass of extracellular matrix with scattered neural crest-derived keratocytes), and the posterior endothelium (a monolayer of neural crest-derived cells) (Figure 2) [4,5].
In the mouse, Pax6 expression is first detected at the optic pit, head surface ectoderm, and neural ectoderm on E8.
Sp1 expression first detected in the head surface ectoderm as early as E10.5 continues in the cornea in the later stages [154].
Although LECs are derived from surface ectoderm, they express vimentin [38] as well as the epithelial surface marker, keratin, and E-cadherin.
Both arise from trapped pouches of ectoderm, near normal folds or from failure of surface ectoderm to separate from the neural tube.
Using Lgr4-driven [beta]-galactosidase expression to probe for Lgr4 expression in Lgr4 heterozygotes, we found that at E12.5, Lgr4 is primarily expressed in a layer of mesenchymal cells between the surface ectoderm and the optic cup; limited expression is also detectable in the lens and the outer layer of the optic cup (Figure 2).

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