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

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

Blastodermatic :: Blastodermatic (a.) Alt. of Blastodermi.

Triploblastic :: Triploblastic (a.) Of, pertaining to, or designating, that condition of the ovum in which there are three primary germinal layers, or in which the blastoderm splits into three layers..

Splanchno-skeleton :: Splanchnopleure (n.) The inner, or visceral, one of the two lamellae into which the vertebrate blastoderm divides on either side of the notochord, and from which the walls of the enteric canal and the umbilical vesicle are developed. See Somatopleure..

Delamination :: Delamination (n.) Formation and separation of laminae or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated.

Neuro-epidermal :: Neuro-epidermal (a.) Pertaining to, or giving rise to, the central nervous system and epiderms; as, the neuroepidermal, or epiblastic, layer of the blastoderm..

Blastula :: Blastula (n.) That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

Blastoderm :: Blastoderm (n.) The germinal membrane in an ovum, from which the embryo is developed..

Somatopleure :: Somatopleure (n.) The outer, or parietal, one of the two lamellae into which the vertebrate blastoderm divides on either side of the notochord, and from which the walls of the body and the amnion are developed. See Splanchnopleure..

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

Blastodermic :: Blastodermic (a.) Of or pertaining to the blastoderm.

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..

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

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

Gastrodisc :: Gastrodisc (n.) That part of blastoderm where the hypoblast appears like a small disk on the inner face of the epibladst.

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..

Halones :: Halones (n. pl.) Alternating transparent and opaque white rings which are seen outside the blastoderm, on the surface of the developing egg of the hen and other birds..

Entoderm :: Entoderm (n.) See Endoderm, and Illust. of Blastoderm..

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