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Metazoa :: Metazoa (n. pl.) Those animals in which the protoplasmic mass, constituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa..

Ectodermic :: Ectodermic (a.) Of or relating to the ectoderm.

Ectoderm :: Ectoderm (n.) The external skin or outer layer of an animal or plant, this being formed in an animal from the epiblast. See Illust. of Blastoderm..

-derm :: -derm (n.) A suffix or terminal formative, much used in anatomical terms, and signifying skin, integument, covering; as, blastoderm, ectoderm, etc..

Notochord :: Notochord (n.) An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebrae and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm..

Ectental :: Ectental (a.) Relating to, or connected with, the two primitive germ layers, the ectoderm and ectoderm; as, the ectental line or line of juncture of the two layers in the segmentation of the ovum..

Syndactyle :: Syncytium (n.) The ectoderm of a sponge.

Neurenteric :: Neurenteric (a.) Of or pertaining to both the neuron and the enteron; as, the neurenteric canal, which, in embroys of many vertebrates, connects the medullary tube and the primitive intestine. See Illust. of Ectoderm..

Protovertebra :: Protovertebra (n.) One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm..

Epiblast :: Epiblast (n.) The outer layer of the blastoderm; the ectoderm. See Blastoderm, Delamination..

Mesogl/a :: Mesogl/a (n.) A thin gelatinous tissue separating the ectoderm and endoderm in certain coelenterates.

Hypoblast :: Hypoblast (n.) The inner or lower layer of the blastoderm; -- called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm..

Ectoblast :: Ectoblast (n.) The outer layer of the blastoderm; the epiblast; the ectoderm.

Mesoderm :: Mesoderm (n.) The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See Illust. of Blastoderm and Ectoderm..

Endoderm :: Endoderm (n.) The innermost layer of the blastoderm and the structures derived from it; the hypoblast; the entoblast. See Illust. of Ectoderm.

Ectoderm :: Ectoderm (n.) The outer layer of the blastoderm; epiblast.

Ectodermal :: Ectodermal (a.) Alt. of Ectodermi.

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