These thickened tracts of ectoderm in Peripatus and a few other forms can be clearly seen to surround the blastopore.
Ectoblast: the outer wall of a cell; the ectoderm or epiblast.
Farther up, within the velar area, the rudiments of the cerebral nerve-ganglion ng are seen separating from the ectoderm.
Metablastic: relating to the ecto- or meta-blast or ectoderm.
D, E, F, a thickening of the ectoderm on the distal side of the bud forms an entocodon (Gc).
The outer is the ectoderm and the inner is the Endoderm or Hypoblast.
Amongst other structures which arise from the important layer of ectoderm are the teeth.
The medusoids have a muscular velum of ectoderm and mesogloea only.
The gonads, whether formed in the polyp or the medusa, are developed in the ectoderm.
It has been shown that these asulcar filaments are derived from the ectoderm, the remainder from the endoderm.
ectoderm ec·to·derm (ěk'tə-dûrm')
The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and sense organs develop. Also called ectoblast.
The outermost of the primary germ layers of an animal embryo. In vertebrates, the ectoderm gives rise to the epidermis and associated tissues (such as hair and sweat glands), enamel of the teeth, sense organs, nervous system, and lining of the nose, mouth, and anus. Compare endoderm, mesoderm.