endoderm

/en-duh-durm/US // ˈɛn dəˌdɜrm //UK // (ˈɛndəʊˌdɜːm) //

内胚层,内皮层,内皮细胞,内生层

Definitions

n.名词 noun

1
- : Also called endoblast. Embryology. the innermost cell layer of the embryo in its gastrula stage.
- : Anatomy. the innermost body tissue that derives from this layer, as the gut lining.

Ahlborn, in 1884, drew a sharp distinction between the segments of the mesoderm and those of the endoderm.
In yet others it is partly derived from endoderm and partly from ectoderm (primitive streak of amniotic Vertebrates).
In it cleavage gives rise to a solid mass, which divides by delamination into two layers, the ectoderm and endoderm.
The endoderm, on the other hand, gives rise to the lining of the enteron, and of the glands which open into it.
These are three in number, being called respectively the ectoderm, endoderm and The layer theory.