ectoderm


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Related to ectoderm: mesoderm

ec·to·derm

 (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.

ectoderm

(ˈɛktəʊˌdɜːm) or

exoderm

n
(Biology) the outer germ layer of an animal embryo, which gives rise to epidermis and nervous tissue. See also mesoderm, endoderm
ˌectoˈdermal, ˌectoˈdermic adj

ec•to•derm

(ˈɛk təˌdɜrm)

n.
the outer germ layer in the embryo of a metazoan.
[1860–65]
ec`to•der′mal, ec`to•der′mic, adj.
ec`to•der•moi′dal (-dərˈmɔɪd l) adj.

ectoderm

An embryo’s outer germ layer, which develops into structures including the brain and skin. See endoderm,mesoderm
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ectoderm - the outer germ layer that develops into skin and nervous tissueectoderm - the outer germ layer that develops into skin and nervous tissue
germ layer - (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
neural tube - a tube of ectodermal tissue in the embryo from which the brain and spinal cord develop
Translations

ec·to·derm

n. ectodermo, la capa más externa del embrión.
References in periodicals archive ?
The shape of the aboral and oral ectoderm and the ciliary band that comprise the ADL, particularly in relation to the distribution and orientation of putative sensory cells therein, evokes a functional morphological explanation.
The resulting bucconasal membrane, consisting of a layer each of ectoderm and endoderm, separates the two compartments.
No one has yet been able to induce the cells to form the three distinct germ layers, in the correct order: endoderm on the inside, mesoderm in the middle and ectoderm on the outside.
(3) During the 3-5 weeks of gestational age neurulation occurs during which formation of the neural groove, closure of the anterior (25 days) and posterior (27 to 28 days) neuropores, appearance of the ventral horn cells, formation of anterior and posterior roots and disjunction of the neuroectoderm from the surface ectoderm takes place.
The cell bodies of the diffuse nervous system of the larva lie in the apical plate and around the ciliated band that borders the oral ectoderm. Axons extend beneath the ciliated bands and to the muscles derived from the coeloms (Lacalli and West, 1993).
Teratomas are primary congenital tumors made up of tissue that arises from all three embryonic germ cell layers: the ectoderm, the endoderm, and the mesoderm (although there have been reports of tumors made up of only bidermal ingredients).
The pluripotent cells of the embryo organize themselves at an early stage in germ layers: the endoderm, mesoderm and ectoderm.
They are usually unilateral, unilocular, smooth- surfaced lesions filled with fatty material, containing tissues from all three embryonic layers- endoderm, mesoderm and ectoderm.
This specification occurs at the end of gastrulation, when the region that will form the future neural crest encompasses the border strip of the embryonic ectoderm and is situated at the interface between the neural and adjacent non-neural territories.
The tongue comprises two parts that have different embryologic origins; the anterior two-thirds of the tongue arise from the ectoderm and the posterior one-third from the endoderm.
These totipotent cells can differentiate into tissue components representing derivatives of mesoderm, ectoderm and endoderm.
At 24 h, the assays were scored as fusions if the polyps fused to create a single gastric cavity and common ectoderm, or as rejections if they fell apart.