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The outer layer of the blastoderm; epiblast.

Of or relating to the ectoderm.

much used in anatomical terms, and signifying skin, integument, covering; as, blastoderm, ectoderm, etc.

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. C. S. Minot.

The outer layer of the blastoderm; the epiblast; the ectoderm.

astoderm and the structures derived from it; the hypoblast; the entoblast. See Illust. of Ectoderm.

The outer layer of the blastoderm; the ectoderm. See Blastoderm, Delamination.

endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm.

The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See Illust. of Blastoderm and Ectoderm.

A thin gelatinous tissue separating the ectoderm and endoderm in certain coelenterates. -- Mes`o*gloeal, a.

s 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.

many vertebrates, connects the medullary tube and the primitive intestine. See Illust. of Ectoderm.

osterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.

anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm.

The ectoderm of a sponge.