germ layer

A layer of cells produced during the process of gastrulation during the early development of the animal embryo, which is distinct from other such layers of cells, as an early step of cell differentiation. The three types of germ layers are the endoderm, ectoderm, and mesoderm. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the germ layer is

A layer of cells produced during the process of gastrulation during the early development of the animal embryo, which is distinct from other such layers of cells, as an early step of cell differentiation. The three types of germ layers are the endoderm, ectoderm, and mesoderm. The atlas records it as a tissue at the tissue scale in the human body.

Where the germ layer is

This dataset records no region or system for it. No positional evidence of any kind. Drawn outside the body so it can still be found and counted, never inside it.

What the germ layer connects to

The atlas records 8 typed relationships for it, across 4 kinds of connection. part of embryo.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the germ layer. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as embryonic tissue, germinal layer, primary germ layer, embryonic germ layer and embryonic germ layers. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0000923, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: embryo.
• A kind of: embryonic structure and tissue.
• subtype: ectoderm, endoderm, mesoderm and neuroectoderm.
• Develops from: epiblast (generic).

Questions

Where is the germ layer?

This dataset records no region or system for it. No positional evidence of any kind. Drawn outside the body so it can still be found and counted, never inside it.

What does the germ layer connect to?

Part of: embryo.

Is the germ layer the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.