|- style="text-align: center; line-height: 1;" class="hiddenStructure"
| colspan="2" |Section through embryonic disk of Vespertilio murinus.
|- class="hiddenStructure"
|Latin
|colspan="2"|
|- class="hiddenStructure"
|
|colspan="2"|[subject #6 ]
|- class="hiddenStructure"
|System
|colspan="2"|
|- class="hiddenStructure"
|Precursor
|colspan="2"|
|- class="hiddenStructure"
|MeSH
|colspan="2"|[A16.254.425.273]
|- class="hiddenStructure"
|Dorlands/Elsevier
|colspan="2"|[/]
|}
The ectoderm is the start of a tissue that covers the body surfaces. It emerges first and forms from the outermost of the germ layers.
