The Edinburgh Mouse Atlas: A Digital Atlas of Mouse Development Volume 1 E5.5 to E9.0

Theiler Stage 4 (E3) Mouse Embryo: Blastocyst (ICM apparent)

• Interactive 3D views of selected anatomy using EmbryoView
• SectionView with the Theiler stage 4 embryo. (SectionView only works under Unix - see Viewers)
• Original histological sections (simple text option for non-Java browsers)
• Grey-level voxel model  annotations.
• Anatomical boundary annotations.

Theiler Stage 4 (E3) Stage Definition

	Embryo progresses from morula to the blastocyst still within the zona pellucida (shown in red). There is early evidence of the blastocoelic cavity.  3 dpc (range 2-4)  16-40  compacted cells.  All scale bars in microns.
	In the blastocyst stage (zona-intact) there is a distinct inner cell mass and an outer layer of trophectoderm cells. Usually located in the uterine lumen.