0 the cells in the embryo of a human or animal that develop into skin, hair, and the nervous system
1 the cells in the embryo (= growing organism before it is born) of a human or animal that develop into skin, hair, and the nervous system
And only the epidermis, or outer layer of our skin, and the nervous system and parts of our sense-organs have arisen from the ectoderm.
In the first embryonic structure they are merely a pair of simple cutaneous glands, or depressions in the ectoderm.
In the normal development of the tadpole from the egg, as in all other vertebrate animals, the lens is formed from the outer skin or ectoderm of the head.
The outer envelope of dark smaller cells forms the ectoderm or skin-layer.
We find the first differentiation of epithelial and stinging cells, or of muscular and neural cells, in the thick ectoderm of the hydra.
By the 10-somite stage, there is strong staining in the lateral ectoderm and caudal dorsal neural tube.
The chicken spalt4 gene (csal4) is expressed in the neural tube, migrating neural crest, branchial arches and, transiently, in the cranial ectoderm.
Players remain pluripotential like stem cells, yet to make their way toward differentiation as infielders (mesoderm), outfielders (ectoderm), or pitchers or catchers (endoderm).
