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

Of or relating to, or consisting of, the epiblast.

ve, used principally in biological terms, and signifying growth, formation; as, bioblast, epiblast, mesoblast, etc.

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

The outer layer of the blastoderm; epiblast.

Filled with spongy pith; pithy. Medullary groove (Anat.), a groove, in the epiblast of the vertebrate blastoderm, the edges of which unite, making a tube (the medullary canal) from which the brain and spinal cord are developed. -- Medullary rays (Bot.), the rays of cellular tissue seen in a transverse section of exoge…

proctod, a part at the posterior end, which are formed by invagination and are lined with epiblast.

o, or giving rise to, the central nervous system and epiderms; as, the neuroepidermal, or epiblastic, layer of the blastoderm.

of Nice, A. D. 325. Shipley. -- Primitive groove (Anat.), a depression or groove in the epiblast of the primitive streak. It is not connected with the medullary groove, which appears later and in front of it. -- Primitive plane (Spherical Projection), the plane upon which the projections are made, generally coincidi…

Of or pertaining to a tegument or tegmentum; as, the tegmental layer of the epiblast; the tegmental cells of the taste buds.